 There, he fought in the army of Emperor Michael IV in the Battle of Ostrovo of the 1041 campaign against the Bulgarian uprising led by Peter Delyan, which later gained Harald the nickname the "Bulgar-burner" ("Bolgara brennir") by his skald.Harald was not affected by Maniakes' conflict with Emperor Michael IV, and received honours and respect upon his return to Constantinople.In a Greek book written in the 1070s, the "Strategikon of Kekaumenos", Araltes (i.e.