Edzard II had a dispute with his dominant mother, Anna. She had abolished his right of primogeniture, in an attempt to curb the influence of the Swedish royal family. She decreed that Edzard should rule East Frisia jointly with his younger brothers Johan and Christopher. When Christopher died early, Edzard ran into a strong and almost hateful rivalry with his brother Johan II. The power struggle between two increasingly hamstrung their government. After Johan died in 1591, Edzard became the sole ruler, but his authority had been severely hit by the ongoing conflict.