http://genealogics.org/getperson.php?personID=I00023585&tree=LEO
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Featured National Park champion connections: Erich is 18 degrees from Theodore Roosevelt, 22 degrees from Stephanus Johannes Paulus Kruger, 21 degrees from George Catlin, 21 degrees from Marjory Douglas, 28 degrees from Sueko Embrey, 22 degrees from George Grinnell, 21 degrees from Anton Kröller, 20 degrees from Stephen Mather, 24 degrees from Kara McKean, 23 degrees from John Muir, 12 degrees from Victoria Hanover and 31 degrees from Charles Young on our single family tree. Login to find your connection.
B > Braunschweig-Grubenhagen | V > von Braunschweig-Grubenhagen > Erich (Braunschweig-Grubenhagen) von Braunschweig-Grubenhagen
I would also add, that although a Wikipedia article might be OK to use on an existing unsourced pre-1500 profile, I think it isn't a particularly good source to use to create a new pre-1500 profile, so I'll look for some better sources first.
https://en.wikipedia.org/wiki/Eric_I,_Duke_of_Brunswick-Grubenhagen
Born 1383, died 1427.