Reference for Ketubot 102:19

ליסטות אליסטות לא קשיא הא בבן נצר הא בליסטים דעלמא ובן נצר התם קרי ליה מלך והכא קרי ליה לסטים אין גבי אחשורוש לסטים הוא גבי לסטים דעלמא מלך הוא:

There is also no contradiction between the two rulings concerning captives of highwaymen since the former refers to Ben Netzer while the latter refers to an ordinary highwayman. As to Ben Nezer, there they call him a king and here they call him a highwayman? Yes; in comparison with Ahashverosh he was a highwayman but in comparison with an ordinary robber he was a king.

Jastrow