diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -888,6 +888,34 @@ def obsolete(repo, subset, x):
     getargs(x, 0, 0, _("obsolete takes no arguments"))
     return [r for r in subset if repo[r].obsolete()]
 
+def origin(repo, subset, x):
+    """``origin([set])``
+    Changesets that were specified as a source for the grafts, transplants or
+    rebases that created the given revisions.  Omitting the optional set is the
+    same as passing all().  If a changeset created by these operations is itself
+    specified as a source for one of these operations, only the source changeset
+    for the first operation is selected.
+    """
+    if x is not None:
+        args = set(getset(repo, range(len(repo)), x))
+    else:
+        args = set(getall(repo, range(len(repo)), x))
+
+    def _firstsrc(rev):
+        src = _getrevsource(repo, rev)
+        if src is None:
+            return None
+
+        while True:
+            prev = _getrevsource(repo, src)
+
+            if prev is None:
+                return src
+            src = prev
+
+    o = set([_firstsrc(r) for r in args])
+    return [r for r in subset if r in o]
+
 def outgoing(repo, subset, x):
     """``outgoing([path])``
     Changesets not found in the specified destination repository, or the
@@ -1392,6 +1420,7 @@ symbols = {
     "min": minrev,
     "modifies": modifies,
     "obsolete": obsolete,
+    "origin": origin,
     "outgoing": outgoing,
     "p1": p1,
     "p2": p2,
diff --git a/tests/test-graft.t b/tests/test-graft.t
--- a/tests/test-graft.t
+++ b/tests/test-graft.t
@@ -358,3 +358,50 @@ Resolve conflicted graft with rename
   diff --git a/a b/b
   rename from a
   rename to b
+
+Test simple origin(), with and without args
+  $ hg log -r 'origin()'
+  changeset:   1:5d205f8b35b6
+  user:        bar
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     1
+  
+  changeset:   2:5c095ad7e90f
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     2
+  
+  changeset:   3:4c60f11aa304
+  user:        baz
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     3
+  
+  changeset:   4:9c233e8e184d
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     4
+  
+  changeset:   5:97f8bfe72746
+  branch:      stable
+  parent:      3:4c60f11aa304
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     5
+  
+  $ hg log -r 'origin(7)'
+  changeset:   2:5c095ad7e90f
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     2
+  
+Now transplant a graft to test following through copies
+  $ hg up -q 0
+  $ hg branch -q dev
+  $ hg ci -qm "dev branch"
+  $ hg --config extensions.transplant= transplant -q 7
+  $ hg log -r 'origin(.)'
+  changeset:   2:5c095ad7e90f
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     2
+