Adrian McCallum was a British professional wrestler, professional wrestling promoter and actor, better known by his ring name Lionheart. He wrestled for numerous promotions in the British Independent wrestling circuit including Insane Championship Wrestling, in which he reigned as the ICW World Heavyweight Champion until his death, and Preston City Wrestling. He was also the owner of Ayrshire-based wrestling promotion Pro Wrestling Elite.

Insane Championship Wrestling (ICW) is a professional wrestling promotion based in Glasgow, Scotland, founded by Mark Dallas in 2006. It mixes elements of traditional sports entertainment with hardcore wrestling; thus admittance is restricted to those over 18 years old.