The "Black Knight of Worcestershire" is a fabled character first seen in "A Hard Day's Knight". He's a legendary character from Worcestershire that's famous in Britain. The legend is recorded in the Ballad of the Black Knight. It is also said he still haunts the moors in search of the dragon that slayed him. Candace Flynn was mistaken as his ghost when she found herself stuck in some black armour.
The knight has only been seen wearing full body black armor. His age is unknown but judging by height and facial appearance he is between 15 and 40.