 However, as al-Qasim himself had been killed, his son Jabir al-Kalbi prudently retreated to Sicily without exploiting the victory.In 1006 a new Saracen fleet was defeated again near Reggio Calabria by the Pisans.The emirate reached its cultural peak under the emirs Ja'far (983–985) and Yusuf al-Kalbi (990–998), both patrons of the arts.