After reaching the age of majority in 1329, he had to pass long-term fights with the vassals and neighbours.
These conflicts mainly rose due to Frederick's declaration of peace in 1338, which drastically diminished the rights and influence of the small landlords and the local rulers, and which goal was the subjugation of the latter two groups.
[1] In 1342, dissatisfied nobles, whose concerns were their rights and independence, banded together in Arnstadt (southwest of Erfurt) against Frederick II, in what would be known as the Thuringian Count's War.
Frederick II limited himself to consolidate his rule and to defend against the danger going out from Charles IV.
Frederick II married May 1323 in Nürnberg Mathilde of Bavaria, daughter of Louis IV, Holy Roman Emperor and had 9 children: