diff --git a/IPython/core/interactiveshell.py b/IPython/core/interactiveshell.py
index b9cee99..892f53f 100644
--- a/IPython/core/interactiveshell.py
+++ b/IPython/core/interactiveshell.py
@@ -34,7 +34,6 @@ from IPython.core import oinspect
 from IPython.core import magic
 from IPython.core import page
 from IPython.core import prefilter
-from IPython.core import shadowns
 from IPython.core import ultratb
 from IPython.core.alias import Alias, AliasManager
 from IPython.core.autocall import ExitAutocall
@@ -1155,8 +1154,6 @@ class InteractiveShell(SingletonConfigurable):
         ns['_oh'] = self.history_manager.output_hist
         ns['_dh'] = self.history_manager.dir_hist
 
-        ns['_sh'] = shadowns
-
         # user aliases to input and output histories.  These shouldn't show up
         # in %who, as they can have very large reprs.
         ns['In']  = self.history_manager.input_hist_parsed
diff --git a/IPython/core/shadowns.py b/IPython/core/shadowns.py
deleted file mode 100644
index d2d93b6..0000000
--- a/IPython/core/shadowns.py
+++ /dev/null
@@ -1 +0,0 @@
-""" Shadow namespace """
\ No newline at end of file
diff --git a/IPython/core/tests/test_imports.py b/IPython/core/tests/test_imports.py
index 88caef0..7aa278f 100644
--- a/IPython/core/tests/test_imports.py
+++ b/IPython/core/tests/test_imports.py
@@ -45,9 +45,6 @@ def test_import_prompts():
 def test_import_release():
     from IPython.core import release
 
-def test_import_shadowns():
-    from IPython.core import shadowns
-
 def test_import_ultratb():
     from IPython.core import ultratb