▁king , ▁his ▁nep hew , ▁but ▁to ▁no ▁effect . ▁So on ▁a ▁consp i racy ▁against ▁the ▁det ested ▁Stephen ▁had ▁drawn ▁him ▁in . ▁▁ ▁On ▁ 1 5 ▁December ▁ 1 1 6 7 , ▁when ▁Stephen ▁had ▁the ▁court ▁moved ▁tempor arily ▁to ▁Mess ina , ▁Henry ▁remained ▁at ▁Pal ermo ▁to ▁lead ▁the ▁consp ir ators , ▁whose ▁ranks ▁included ▁Matthew ▁of ▁A j ello , ▁the ▁g ait o ▁or ▁judge ▁Richard ▁and ▁Bishop ▁Gent ile ▁of ▁Agr ig ento . ▁When ▁the ▁court ▁returned ▁to ▁Pal ermo ▁shortly ▁after ▁ 1 2 ▁March ▁ 1 1 6 8 , ▁its ▁last ▁session ▁in ▁Mess ina , ▁Henry ▁demanded , ▁in ▁council , ▁the ▁Princi p ality ▁of ▁Tar anto , ▁which ▁had ▁been ▁conf isc ated ▁from ▁Simon , ▁an ▁il leg it imate ▁son ▁of ▁Roger ▁II , ▁and ▁all ▁of ▁Simon ' s ▁other ▁lands . ▁Then , ▁Gilbert , ▁Count ▁of ▁Gra v ina , ▁another ▁cousin ▁of ▁Henry ▁and ▁Margaret , ▁rose ▁in ▁council , ▁den ounced ▁the ▁count ▁and ▁accused ▁him ▁of ▁tre ason . ▁The ▁charge ▁was ▁easily ▁established , ▁as ▁Henry ▁had ▁admitted ▁the ▁consp i racy ▁to ▁a ▁judge ▁of ▁Mess ina ▁a ▁short ▁time ▁before . ▁He ▁was ▁prompt ly ▁arrested ▁and ▁intern ed ▁in ▁Reg gio ▁di ▁Cal ab ria , ▁while ▁the ▁" Span ish ▁kn ights " ▁who ▁had ▁accompanied ▁him ▁were ▁given ▁a ▁day ▁to ▁leave ▁Sic ily , ▁which ▁they ▁did