diff --git a/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/after/DoubleRoleAnnotationOnData.hs b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/after/DoubleRoleAnnotationOnData.hs
new file mode 100644
index 00000000..93147261
--- /dev/null
+++ b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/after/DoubleRoleAnnotationOnData.hs
@@ -0,0 +1,5 @@
+{-# LANGUAGE RoleAnnotations #-}
+module DoubleRoleAnnotationOnData where
+
+data Foo a = MkFoo a
+type role Foo nominal
diff --git a/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/before/DoubleRoleAnnotationOnData.hs b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/before/DoubleRoleAnnotationOnData.hs
new file mode 100644
index 00000000..0515d77f
--- /dev/null
+++ b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/before/DoubleRoleAnnotationOnData.hs
@@ -0,0 +1,6 @@
+{-# LANGUAGE RoleAnnotations #-}
+module DoubleRoleAnnotationOnData where
+
+data Foo a = MkFoo a
+type role Foo nominal
+type role Foo representational
diff --git a/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/index.md b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/index.md
new file mode 100644
index 00000000..d2e1474e
--- /dev/null
+++ b/message-index/messages/GHC-97170/doubleRoleAnnotationOnData/index.md
@@ -0,0 +1,18 @@
+---
+title: Double role annotation on datatype
+---
+
+## Error Message
+
+```
+DoubleRoleAnnotationOnData.hs:6:1: error: [GHC-97170]
+    Duplicate role annotations for ‘Foo’:
+      type role Foo nominal
+          -- written at DoubleRoleAnnotationOnData.hs:5:1-21
+      type role Foo representational
+          -- written at DoubleRoleAnnotationOnData.hs:6:1-30
+  |
+6 | type role Foo representational
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+```
+
diff --git a/message-index/messages/GHC-97170/index.md b/message-index/messages/GHC-97170/index.md
new file mode 100644
index 00000000..82296e93
--- /dev/null
+++ b/message-index/messages/GHC-97170/index.md
@@ -0,0 +1,11 @@
+---
+title: Duplicate role annotations
+summary: A type declaration has more than one accompanying role annotation
+severity: error
+introduced: 9.8.1
+---
+
+This error occurs if more than one role annotation occurs for a given datatype.
+Note that the role annotations need not be conflicting for this error to arise.
+Also note that the role annotations can occur in different locations from the
+datatype.