Faster than the Fox

Needs Northern Lords: full control of the Kingdom of Sicily's counties, independent, BEFORE 1047, while staying North Germanic Ásatrú (the Steam text says "tribal" but the in-game condition now allows any government - feudal Hæsteinn qualifies). Not available to ruler-designer characters. As Hæsteinn (867): Duchy Conquest CB on Sicily early while the local Muslims fight the Byzantines, capital to Palermo, mop up southern Italy's minors. For the Byzantine-held counties, either hit them in a moment of weakness, or the sneaky route: swear fealty (the emperor tends to grant you the remaining de jure counties), then win an independence faction war - independence being required, it pops as you break free.