Ali ibn Yusuf is well known in Portugal, as he is the Muslim king defeated by Afonso Henriques in the Battle of Ourique. After this battle Afonso Henriques proclaimed himself an independent king and the Kingdom of Portugal was born. Despite this defeat and his inability to conquer the city of Toledo, Ali ibn Yusuf is recognized as a good commander. He focused his military presence in Al-Andalus -where he conquered the city of Zaragoza-although he mainly lived in current Magreb.
Even if this is a gold coin that is beautifully preserved, it is not very expensive. The reason is twofold: these dinars are interesting for very specialized collectors and the coinage of Al-Andalus is full of very rare coins.