After his abdication Northumbrian history degenerates into a record of dynastic murders.
In 1821 he became king of Savoy by the abdication of his brother, and the construction of the highroad from Cagliari to Porto Torres was begun (not without opposition on the part of the inhabitants) in 1822.
In March 1490 the county of Tirol was added to his possessions through the abdication of his kinsman, Count Sigismund, and this district soon became his favourite residence.
In 1840, on the abdication of his father, he ascended the throne as William II.
A military conspiracy was formed, and on the night of the 10th of August the prince was seized in the palace at Sofia, and compelled to sign his abdication; he was then hurried to the Danube at Rakhovo, transported on his yacht to Reni, and handed over to Russian authorities, by whom he was allowed to proceed to Lemberg.