Q:Facts: - burial place: cathedral in gustrow - mother: matilda of werle-goldberg - death date: 5 april 1421 - father: lorenz of werle-gustrow - birth date: circa 1375 - name: balthasar of werle Based on these bullet points, write a short biography describing the life of balthasar of werle .
A:
balthasar , lord of werle-gustrow -lrb- c. 1375 -- 5 april 1421 -rrb- was lord of werle-gustrow from 1393 or 1394 to 1421 and prince of wenden from 1418 .he was the eldest son of lorenz of werle and matilda of werle-goldberg -lrb- d. before 17 december 1402 -rrb- .after his father 's death in 1393 or 1394 , he initially ruled werle-gustrow alone , but probably together with his brother john vii from 11 december 1395 and from 1 may 1401 with his brother william .from 1 may 1418 , the brothers called themselves princes of wenden after they found evidence of royal lineage in the chronicles of bishop otto of havelberg .baltasar died on 5 april 1421 and was buried in the cathedral in gustrow .he had been engaged to agnes , daughter of duke bogislaw vi of pomerania , but they never married .he was first married on 18 october 1397 to euphemia -lrb- d. 16 october 1417 -rrb- , daughter of duke magnus i of mecklenburg .he later married heilwig , daughter of count gerhard vi of holstein-rendsburg -lrb- d. before 1436 -rrb- .heilwig later married dietrich of oldenburg .no children of balthasar are known .