He acted as regent in 1183, but he showed some incapacity in the struggle with Saladin, and was deprived of all right of succession.
In the following year, by the death, of Ferdinand of Aragon, his maternal grandfather, and the incapacity of his mother Joanna, who had become hopelessly insane, he succeeded to the crowns of Castile and Aragon, which carried with them large possessions in Italy and the dominion, of the New World of America.
The tawdry and exaggerated rhetoric; the petty vanity and jealousies; the weak sentimentalism; the utter incapacity for proportioning means to ends, and for grasping the stern realities of things, which so commonly disfigure the lives and conduct even of the more honest members of his class, were wholly alien to his nature.
It is in the attempt to supply the place of this continuo (or _ figured bass) by definite orchestral parts that modern per formances, until the most recent times, have shown so radical an incapacity to grasp the nature of 18th-century instrumentation.
In spite of repeated efforts on the part of the Ghibellines, in spite of King Roberts supine incapacity, the imperialists gained no permanent advantage.