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Nikolaus I. Mecklenburg zu Werle was born circa 1210 to Heinrich Borwin II. zu Mecklenburg (1170-1226) and Christine of Sweden (-aft1248) and died 14 May 1277 of unspecified causes. He married Jutta von Anhalt (c1215-aft1277) 1231 JL .
Children
| Name | Birth | Death | Joined with |
| Tochter zu Werle (c1243-c1290) | |||
| Tochter zu Werle (c1244-c1291) | 1244 | 1291 | Albrecht I. zu Mecklenburg (aft1230-1265) |
| Bernhard I. zu Werle (c1245-c1286) | |||
| Hedwig zu Werle (1243-1287) | 1243 | 1287 | Johann II. von Brandenburg (1237-1281) |
| Heinrich I. zu Werle (c1245-1291) | 1245 | 8 October 1291 Saal | Rikissa of Sweden (c1237-aft1288) Mathilde von Braunschweig-Lüneburg |
| Johann I. zu Werle (c1245-1283) | 1245 | 15 October 1283 | Sophia von Lindow-Ruppin |
Footnotes (including sources)
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