▁joint ▁king ship . ▁Although ▁later ▁trad itions ▁speak ▁of ▁a ▁marriage , ▁Ad ela ide ▁refused ▁to ▁be ▁married ▁and ▁fled ▁to ▁Can ossa . ▁She ▁was ▁track ed ▁down ▁and ▁imprison ed ▁for ▁four ▁months ▁at ▁Como . ▁ ▁German ▁invasion ▁ ▁In ▁ 9 5 1 , ▁King ▁Otto ▁I ▁of ▁Germany ▁inv aded ▁Italy , ▁forcing ▁the ▁release ▁of ▁Ad ela ide ▁and ▁marry ing ▁her ▁himself . ▁He ▁made ▁no ▁effort ▁to ▁dep ose ▁the ▁k ings ▁of ▁Italy , ▁however . ▁Instead , ▁Ad al bert ▁and ▁Ber eng ar ▁were ▁comp elled ▁to ▁attend ▁the ▁Diet ▁of ▁A ugs burg ▁in ▁Germany ▁in ▁August ▁ 9 5 2 , ▁where ▁Otto ▁formally ▁inv ested ▁them ▁with ▁the ▁kingdom ▁of ▁Italy , ▁thus ▁subject ing ▁the ▁kingdom ▁to ▁Germany . ▁Between ▁ 9 5 3 ▁and ▁ 9 5 6 , ▁Ad al bert ▁and ▁Ber eng ar ▁bes ie ged ▁Count ▁Ad al bert ▁Az zo ▁of ▁Can ossa ▁in ▁his ▁castle , ▁where ▁Ad ela ide ▁had ▁taken ▁refuge ▁in ▁ 9 5 1 . ▁In ▁ 9 5 6 , ▁Duke ▁Li ud olf ▁of ▁Sw ab ia , ▁Otto ' s ▁son , ▁entered ▁Italy ▁with ▁a ▁large ▁army ▁to ▁re - assert ▁his ▁father ' s ▁authority . ▁Ad al bert ▁gathered ▁a ▁large ▁force ▁to ▁opp ose ▁him . ▁He ▁defeated ▁Li ud olf , ▁but ▁before ▁the ▁latter ▁could ▁return ▁to ▁Germany ▁he ▁died ▁in ▁September ▁ 9 5 7