diff --git a/config/sync/user.role.admin.yml b/config/sync/user.role.admin.yml
index 8815621..4a4ee65 100644
--- a/config/sync/user.role.admin.yml
+++ b/config/sync/user.role.admin.yml
@@ -16,3 +16,4 @@ permissions:
   - 'create ligne_comptable content'
   - 'delete any ligne_comptable content'
   - 'edit any ligne_comptable content'
+  - 'view ligne_comptable revisions'
diff --git a/config/sync/user.role.editeur.yml b/config/sync/user.role.editeur.yml
index e1e6815..8c9cd99 100644
--- a/config/sync/user.role.editeur.yml
+++ b/config/sync/user.role.editeur.yml
@@ -16,3 +16,4 @@ permissions:
   - 'create ligne_comptable content'
   - 'delete any ligne_comptable content'
   - 'edit any ligne_comptable content'
+  - 'view ligne_comptable revisions'
diff --git a/config/sync/user.role.user.yml b/config/sync/user.role.user.yml
index 5036c41..87d0f3d 100644
--- a/config/sync/user.role.user.yml
+++ b/config/sync/user.role.user.yml
@@ -2,7 +2,10 @@ uuid: 24f4e46d-c714-486d-b000-f092eb727470
 langcode: en
 status: true
 dependencies:
+  config:
+    - node.type.ligne_comptable
   module:
+    - node
     - system
 id: user
 label: 'Utilisateur (lecture seule)'
@@ -10,3 +13,4 @@ weight: 4
 is_admin: false
 permissions:
   - 'access content'
+  - 'view ligne_comptable revisions'
diff --git a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.links.menu.yml b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.links.menu.yml
index 3b673cd..58a5346 100644
--- a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.links.menu.yml
+++ b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.links.menu.yml
@@ -13,3 +13,11 @@ figli_compta_ledger.dashboard:
   menu_name: admin
   parent: system.admin
   weight: -10
+
+figli_compta_ledger.history:
+  title: 'Historique du grand livre'
+  description: 'Toutes les révisions de toutes les lignes comptables'
+  route_name: figli_compta_ledger.history
+  menu_name: admin
+  parent: system.admin
+  weight: -9
diff --git a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.module b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.module
index 3833e4d..00945f8 100644
--- a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.module
+++ b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.module
@@ -2,8 +2,11 @@
 
 /**
  * @file
- * Enforces the one invariant that explained most of the errors found in the
- * historical spreadsheets: sum(répartition.montant) must equal montant_ht.
+ * Enforces two invariants for ligne_comptable: sum(répartition.montant)
+ * must equal montant_ht (explained most of the errors found in the
+ * historical spreadsheets), and every save must create a revision with no
+ * way to opt out, for an audit trail of who changed the shared ledger and
+ * when.
  */
 
 use Drupal\node\NodeInterface;
@@ -33,6 +36,21 @@ function figli_compta_ledger_form_alter(&$form, FormStateInterface $form_state,
   }
   $form['#validate'][] = 'figli_compta_ledger_validate_repartition';
 
+  // Every save must create a revision, unconditionally -- there's no
+  // legitimate reason to skip it for an accounting record, so don't let
+  // anyone opt out. #access = FALSE (rather than just leaving the
+  // #default_value alone) makes Form API discard whatever a tampered
+  // request might submit for this field and fall back to #default_value.
+  // figli_compta_ledger_node_presave() enforces the same thing for any
+  // save that doesn't go through this form at all.
+  if (isset($form['revision'])) {
+    $form['revision']['#default_value'] = TRUE;
+    $form['revision']['#access'] = FALSE;
+  }
+  if (isset($form['revision_log'])) {
+    $form['revision_log']['#access'] = FALSE;
+  }
+
   $request = \Drupal::request();
   $wrapper_formats = ['drupal_ajax', 'drupal_modal', 'drupal_dialog'];
   $is_ajax_modal = in_array($request->query->get('_wrapper_format'), $wrapper_formats, TRUE)
@@ -110,6 +128,20 @@ function figli_compta_ledger_node_presave(NodeInterface $node) {
   if ($node->bundle() !== 'ligne_comptable') {
     return;
   }
+
+  // Force a revision on every save, with no log message and the actual
+  // acting user as its author -- this is the audit trail for a shared
+  // ledger, not the répartition-sum check below, so it's never exempted
+  // (not even during a skip_validation import: migrated data still needs
+  // an honest revision history).
+  $node->setNewRevision(TRUE);
+  $node->setRevisionLogMessage('');
+  $node->setRevisionUserId(\Drupal::currentUser()->id());
+  // setNewRevision() alone doesn't refresh this -- it stays whatever it
+  // was on the entity as loaded (the previous revision's timestamp),
+  // silently mislabeling every edit with its predecessor's save time.
+  $node->setRevisionCreationTime(\Drupal::time()->getRequestTime());
+
   if (!$node->hasField('field_montant_ht') || !$node->hasField('field_repartition')) {
     return;
   }
@@ -142,7 +174,7 @@ function figli_compta_ledger_node_presave(NodeInterface $node) {
 function figli_compta_ledger_theme($existing, $type, $theme, $path) {
   return [
     'figli_compta_home' => [
-      'variables' => [],
+      'variables' => ['can_view_history' => FALSE],
       'template' => 'figli-compta-home',
     ],
     'figli_compta_dashboard' => [
diff --git a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.routing.yml b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.routing.yml
index 0d2148b..9ddd8fc 100644
--- a/web/modules/custom/figli_compta_ledger/figli_compta_ledger.routing.yml
+++ b/web/modules/custom/figli_compta_ledger/figli_compta_ledger.routing.yml
@@ -13,3 +13,11 @@ figli_compta_ledger.dashboard:
     _title: 'Tableau de bord - SAS Figures Libres'
   requirements:
     _permission: 'access content'
+
+figli_compta_ledger.history:
+  path: '/lignes/historique'
+  defaults:
+    _controller: '\Drupal\figli_compta_ledger\Controller\HistoryController::history'
+    _title: 'Historique du grand livre - SAS Figures Libres'
+  requirements:
+    _permission: 'view ligne_comptable revisions'
diff --git a/web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php b/web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php
index e335921..be4c611 100644
--- a/web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php
+++ b/web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php
@@ -17,6 +17,7 @@ class DashboardController extends ControllerBase {
   public function home() {
     return [
       '#theme' => 'figli_compta_home',
+      '#can_view_history' => $this->currentUser()->hasPermission('view ligne_comptable revisions'),
       '#attached' => [
         'library' => ['figli_compta_ledger/home'],
       ],
diff --git a/web/modules/custom/figli_compta_ledger/src/Controller/HistoryController.php b/web/modules/custom/figli_compta_ledger/src/Controller/HistoryController.php
new file mode 100644
index 0000000..470fa91
--- /dev/null
+++ b/web/modules/custom/figli_compta_ledger/src/Controller/HistoryController.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\figli_compta_ledger\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Url;
+
+/**
+ * Grand livre history: a single reverse-chronological feed across every
+ * ligne_comptable's revisions, rather than Drupal's default per-node
+ * history page -- a revision of one ligne is, conceptually, a revision of
+ * the grand livre as a whole.
+ */
+class HistoryController extends ControllerBase {
+
+  /**
+   * Lists every ligne_comptable revision, most recent change first.
+   */
+  public function history() {
+    $node_storage = $this->entityTypeManager()->getStorage('node');
+    $date_formatter = \Drupal::service('date.formatter');
+
+    $revision_ids = $this->entityTypeManager()->getStorage('node')->getQuery()
+      ->accessCheck(TRUE)
+      ->allRevisions()
+      ->condition('type', 'ligne_comptable')
+      ->sort('revision_timestamp', 'DESC')
+      ->pager(50)
+      ->execute();
+
+    $rows = [];
+    foreach ($revision_ids as $vid => $nid) {
+      $revision = $node_storage->loadRevision($vid);
+      if (!$revision) {
+        continue;
+      }
+      $author = $revision->getRevisionUser();
+      $rows[] = [
+        $date_formatter->format($revision->getRevisionCreationTime(), 'short'),
+        $author ? $author->getDisplayName() : $this->t('Utilisateur supprimé'),
+        $revision->hasField('field_date_ligne') ? $revision->get('field_date_ligne')->value : '',
+        $revision->label(),
+        $revision->hasField('field_montant_ht') && !$revision->get('field_montant_ht')->isEmpty()
+          ? $revision->get('field_montant_ht')->value . ' €'
+          : '',
+        [
+          'data' => [
+            '#type' => 'link',
+            '#title' => $this->t('Voir cette version'),
+            '#url' => Url::fromRoute('entity.node.revision', [
+              'node' => $nid,
+              'node_revision' => $vid,
+            ]),
+          ],
+        ],
+      ];
+    }
+
+    return [
+      'table' => [
+        '#type' => 'table',
+        '#header' => [
+          $this->t('Modifié le'),
+          $this->t('Par'),
+          $this->t('Date de la ligne'),
+          $this->t('Ligne'),
+          $this->t('Montant HT'),
+          $this->t('Version'),
+        ],
+        '#rows' => $rows,
+        '#empty' => $this->t('Aucune révision.'),
+        '#attributes' => ['class' => ['figli-historique-table']],
+      ],
+      'pager' => [
+        '#type' => 'pager',
+      ],
+      '#cache' => [
+        'contexts' => ['user.permissions'],
+        'tags' => ['node_list:ligne_comptable'],
+      ],
+    ];
+  }
+
+}
diff --git a/web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig b/web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig
index f47560c..df10fd3 100644
--- a/web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig
+++ b/web/modules/custom/figli_compta_ledger/templates/figli-compta-home.html.twig
@@ -9,6 +9,11 @@
 <div id="figli-home-app">
   <div class="figli-toolbar">
     <a href="/node/add/ligne_comptable" class="button button--primary" @click.prevent="openAddForm">+ Ajouter une ligne</a>
+    {% endverbatim %}
+    {% if can_view_history %}
+      <a href="{{ path('figli_compta_ledger.history') }}" class="button">Historique</a>
+    {% endif %}
+    {% verbatim %}
 
     <label>Compte
       <select v-model="filterCompte">