Einhard. The Life of the Emperor Charles. Chapter 21.
He liked foreigners, and was at great pains to take them under his protection. There were often so many of them, both in the palace and the kingdom, that they might reasonably have been considered a nuisance; but he, with his broad humanity, was very little disturbed by such annoyances, because he felt himself compensated for these great inconveniences by the praises of his generosity and the reward of high renown.