diff --git a/proto/st-peter-admin.proto b/proto/st-peter-admin.proto
index 1131019..f8cf139 100644
--- a/proto/st-peter-admin.proto
+++ b/proto/st-peter-admin.proto
@@ -30,6 +30,10 @@ service AuthAdminService {
   rpc GetRoleScopes (GetRoleScopesRequest) returns (GetRoleScopesResponse);
   rpc GetUserWithRoles (GetUserWithRolesRequest) returns (GetUserWithRolesResponse);
   rpc GetAssignableRoles (GetAssignableRolesRequest) returns (GetAssignableRolesResponse);
+  // §role-grant-history — everyone who EVER held one of role_names for
+  // target_id (revoked grants included when include_deleted). Actor-gated:
+  // requested roles untargeted (all targets) or targeted at target_id.
+  rpc GetRoleGrantHistory (GetRoleGrantHistoryRequest) returns (GetRoleGrantHistoryResponse);
   rpc UpdateUserInfo (UpdateUserInfoRequest) returns (UpdateUserInfoResponse);
   rpc GetScopeAncestors (GetScopeAncestorsRequest) returns (GetScopeAncestorsResponse);
   rpc GetScopeDescendants (GetScopeDescendantsRequest) returns (GetScopeDescendantsResponse);
@@ -554,3 +558,22 @@ message ClearUserSessionsResponse {
   string message = 3;
   int32 cleared_count = 4;
 }
+
+message GetRoleGrantHistoryRequest {
+  string actor_token = 1;
+  repeated string role_names = 2;
+  string target_id = 3;   // uuid of the entity (e.g. an advertiser)
+  bool include_deleted = 4;
+}
+
+message RoleGrantUser {
+  string user_id = 1;
+  string display_name = 2;
+}
+
+message GetRoleGrantHistoryResponse {
+  bool success = 1;
+  ResultCode result_code = 2;
+  string message = 3;
+  repeated RoleGrantUser users = 4;
+}
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 7e8de81..8fcf51c 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "st-peter-client"
-version = "0.2.3"
+version = "0.2.4"
 edition = "2021"
 description = "Official Rust client for st-peter (aura-users) — authentication over gRPC with a token-verify cache"
 repository = "https://git.awesomike.com/pub/st-peter-client"
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 5ea1bcf..c3d9a02 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -427,6 +427,35 @@ impl AdminClient {
         Ok(resp.users)
     }
 
+    /// §role-grant-history — everyone who EVER held one of `role_names` for
+    /// `target_id` (revoked grants included when `include_deleted`). Gated by
+    /// the ACTOR's own token: any requested role untargeted (all targets) or
+    /// targeted at `target_id`; otherwise the server returns FORBIDDEN in the
+    /// response envelope. Returns (user_id, display_name), PII-free.
+    pub async fn get_role_grant_history(
+        &self,
+        actor_token: &str,
+        role_names: Vec<String>,
+        target_id: &str,
+        include_deleted: bool,
+    ) -> Result<Vec<adminpb::RoleGrantUser>> {
+        let resp = self
+            .inner
+            .clone()
+            .get_role_grant_history(adminpb::GetRoleGrantHistoryRequest {
+                actor_token: actor_token.to_string(),
+                role_names,
+                target_id: target_id.to_string(),
+                include_deleted,
+            })
+            .await?
+            .into_inner();
+        if !resp.success {
+            return Err(Error::Rejected { code: resp.result_code, message: resp.message });
+        }
+        Ok(resp.users)
+    }
+
     /// Assign a role to a user — targeted when `target_id` is set (the
     /// multi-tenancy device: e.g. `cms-content-editor` for one organization),
     /// optionally time-bound via `expires_at`.