Dio, Book II. "And because his brother did not cooperate with him, he secretly put him out of the way by means of poison administered by his wife."
Zonaras 7, 9.
Romans and in other ways honoured them as superior to themselves.
This was the course these matters took. Now Tullius joined his daughters in marriage with the Tarquins, and though he announced that he was going to restore the kingdom to them, he kept putting it off, on one pretext after another. And they were in no amiable frame of mind, but were indignant. The king paid no heed to them and urged the Romans to democracy and freedom. At this the Tarquins were all the more vexed. But the younger brother, angry as he was, still endured it, while the older one decided he could bear Tullius no longer. And when he found that his wife did not approve his attitude, any more than did his brother, he put his wife to death himself and compassed his brother's death by means of poison administered by the latter's wife. Then joining himself to his brother's wife, he plotted with her against Tullius. After persuading many of the senators and patricians who had grievances against Tullius to coöperate with him, he unexpectedly repaired with them to the senate, his wife Tullia also following him. And he spoke at considerable length, reminding those present of his father's worth and uttering many jests at the expense of Tullius. When the latter, on hearing of it, hastily made his appearance and even spoke a few words,
