Under his reign the Zayyanid Kingdom of Tlemcen extended over present-day north-western Algeria.

He was successful in his military campaigns against the Merinids and the Maqil Arab tribe.

The governor of Ceuta, Abou'l-Hassan ben-Khelas, had revolted against the Almohads and recognised the sovereignty of Yaghmurasen, after this the Almohad ruler decided to march against Tlemcen but was defeated by Yaghmurasen.

He commented about this claim in his local Berber language and said this: If it is true, it will benefit us before God; but, in this world, we will owe our success only to our swords.

[5]When an architect wanted to write his name on a minaret that he had built, Yaghmurasen replied in his Zenati dialect "God knows" (Issen Rebbi).