John III, Lord of Mecklenburg (after 1266 – 27 May 1289 at Poel) was co-ruler of Mecklenburg from 1287 until his death. He was the son of Henry I and his wife Anastasia of Pomerania. From 1287 to 1289, he ruled Mecklenburg jointly with his elder brother Henry II, under the regency of their uncle NIcholas III.
John III, Lord of Mecklenburg (after 1266 – 27 May 1289 at Poel) was co-ruler of Mecklenburg from 1287 until his death. He was the son of Henry I and his wife Anastasia of Pomerania. From 1287 to 1289, he ruled Mecklenburg jointly with his elder brother Henry II, under the regency of their uncle NIcholas III.
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