Claim: Henry I of Werle (Henry was married twice to Rikissa Birgersdotter and  to Matilde of Brunswick-Lüneburg) was the son Prince Nicholas I of Mecklenburg-Werle and he ruled following his fathers death until 1283.
Evidence: Rikissa Birgersdotter
Matilde of Brunswick-Lüneburg He was the son Prince Nicholas I of Mecklenburg-Werle and his wife Princess Jutta of Anhalt the daughter of Prince Henry I of Anhalt and his wife Princess Irmgard of Thuringia. Henry and his brother John ruled Mecklenburg-Werle jointly following the death of their father on 10 May 1277. Henry and his brother ruled jointly until 1283 when Henry founded the principality of Mecklenburg-Güstrow while John took up residence in the principality of Mecklenburg-Parchim which he ruled jointly with Prince Pribislaw II.