diff --git a/Packages/Cartesian_kernel/changes.txt b/Packages/Cartesian_kernel/changes.txt
index 4145db00ac6..faee5ab3708 100644
--- a/Packages/Cartesian_kernel/changes.txt
+++ b/Packages/Cartesian_kernel/changes.txt
@@ -1,3 +1,7 @@
+Version 6.66 (20 January 2003)
+- Remove obsolete left/right_turn function based on Origin : they are obsolete,
+  and they didn't compile even in 2.4.
+
 Version 6.65 (20 January 2003)
 - Finish last change : remove *handle_[23] types from the main kernel classes.
 
diff --git a/Packages/Cartesian_kernel/include/CGAL/Cartesian/predicates_on_points_2.h b/Packages/Cartesian_kernel/include/CGAL/Cartesian/predicates_on_points_2.h
index 9ae5fc9f75a..278c9c1ba7d 100644
--- a/Packages/Cartesian_kernel/include/CGAL/Cartesian/predicates_on_points_2.h
+++ b/Packages/Cartesian_kernel/include/CGAL/Cartesian/predicates_on_points_2.h
@@ -293,26 +293,6 @@ right_turn(const PointC2<R> &p,
    return orientation(p, q, r) == RIGHT_TURN;
 }
 
-template < class R >
-inline
-bool
-left_turn(const Origin &o,
-          const PointC2<R> &q,
-          const PointC2<R> &r)
-{
-  return Orientation (sign_of_determinant2x2(qx, qy, rx, ry)) == LEFT_TURN;
-}
-
-template < class R >
-inline
-bool
-right_turn(const Origin &o,
-           const PointC2<R> &q,
-           const PointC2<R> &r)
-{
-  return Orientation (sign_of_determinant2x2(qx, qy, rx, ry)) == RIGHT_TURN;
-}
-
 #ifndef CGAL_NO_DEPRECATED_CODE
 template < class R >
 inline
@@ -335,28 +315,6 @@ rightturn(const PointC2<R> &p,
     bool THIS_FUNCTION_IS_DEPRECATED; // Use right_turn instead.
    return orientation(p, q, r) == RIGHT_TURN;
 }
-
-template < class R >
-inline
-bool
-leftturn(const Origin &o,
-         const PointC2<R> &q,
-         const PointC2<R> &r)
-{
-    bool THIS_FUNCTION_IS_DEPRECATED; // Use left_turn instead.
-    return Orientation (sign_of_determinant2x2(qx, qy, rx, ry)) == LEFT_TURN;
-}
-
-template < class R >
-inline
-bool
-rightturn(const Origin &o,
-          const PointC2<R> &q,
-          const PointC2<R> &r)
-{
-    bool THIS_FUNCTION_IS_DEPRECATED; // Use right_turn instead.
-    return Orientation (sign_of_determinant2x2(qx, qy, rx, ry)) == RIGHT_TURN;
-}
 #endif
 
 template <class R>