Basil II ( 958 â `` December 15 1025 ) , was a Byzantine emperor from the Macedonian dynasty from January 10 976 to December 15 , 1025 . Basil II ( , Basileios II ; 958 â `` December 15 , 1025 ) , known in his time as Basil the Porphyrogenitus and Basil the Young to distinguish him from his ancestor Basil I the Macedonian , was a Byzantine emperor from the Macedonian dynasty who reigned from 10 January 976 to 15 December 1025 .