Magnus IV of Sweden
In spite of the fact that Eric never returned Kungahälla, and broke almost all his promises to Haakon, he managed to win his approval. He married Haakon V of Norway's 11-year-old daughter Ingeborg Haakonsdatter. In 1312, Eric married Ingeborg in a double wedding in Oslo. At the same time, Eric's brother Valdemar Magnusson married Ingeborg Eriksdottir of Norway, the daughter of King Eric II of Norway. In 1316 Eric and Ingeborg had a son, the future king Magnus IV of Sweden and in 1317 daughter Euphemia of Sweden.