Convinced that the vigour of the State was becoming enfeebled through inaction, he looked all round for a pretext for getting up a war.
Hor Book I Chapter 22: Tullus Hostilius and the War with Alba.

At last he himself was seized with a lingering illness, and that fierce and restless spirit became so broken through bodily weakness, that he who had once thought nothing less fitting for a king than devotion to sacred things, now suddenly became a prey to every sort of religious terror, and filled the City with religious observances.
Hor Book I Chapter 31: Last Years and Death of Tullus.