Heinrich I. Mecklenburg zu Werle was born circa 1245 to Nikolaus I. zu Werle (c1210-1277) and Jutta von Anhalt (c1215-aft1277) and died 8 October 1291 Saal of assassination. He married Rikissa of Sweden (c1237-aft1288) 1262 JL . He married Mathilde von Braunschweig-Lüneburg 1291 JL . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.
|Offspring of Heinrich I. zu Werle and Rikissa of Sweden (c1237-aft1288)|
|Rixa von Werle (c1268-1317)||1268||26 November 1317||Albrecht II. von Braunschweig-Wolfenbüttel-Göttingen (c1268-1318)|