Titus Thul was the alias that renegade Jedi Knight, Nathaniel Kenobi, used when he was on the run from the Empire.
He used this guise, when his ship, Nathan's Fury, was pulled out of Hyperspace by the Interdictor, Palpatine's Fury. Part of the deception was that he pretended to be part of the Bornaryn Trading Fleet.
He used it again when he came to the Kamino shipyards. He used it to fool the stations operator, Frendo Timms. Unknown to him, all the people on the station, were really illusions created by Asajj Ventress and Abigaile Jade.