Ulrich II was probably born before 1428 and reigned jointly with his father Henry.
Through the mediation of Mayor Otto Voge of Stralsund, an amicable agreement, the Treaty of Ribnitz, was reached on 24 February 1454.
The sticking point was a dispute over the share of Catherine's mother, Sophia of Pomerania, in the inheritance of her brother, Duke Barnim VIII of Pomerania, who had died in 1451.
The Mecklenburg side claimed this share as a dowry for Catherine's wedding.
This affected the Lordships of Barth, Zingst and Damgarten, which Barnim VIII had pledged to Catherine for 20000florins.