Sentence:  OLd "Iohn of Gaunt", time-honoured Lancaſter,/ Haſt thou according to thy oath and band/ Brought hither "Henry" Herford thy bold ſon:/ Heere to make good yͤ boiſtrous late <WSD>appeale</WSD>,/ Which then our leyſure would not let vs heare,/ Againſt the Duke of Norfolke, "Thomas Mowbray"? 
Meaning of the word marked with <WSD> tags:  An accusation; a process which formerly might be instituted by one private person against another for some heinous crime demanding punishment for the particular injury suffered, rather than for the offense against the public.