"You cannot build an empire based on slaughter and deceit. Turhan knew that. I thought you did too."
- – Urza to Londo, 2259
From the alliance of House Jaddo and House Mollari, came the childhood friendship of Jaddo and Londo Mollari. Soon they both blossomed into proud and ambitious young Centauri looking to prove themselves to each other and to the world. Sometime in their youths, they participated in the dueling society "Couro Prido" (Proud Knives) to which Urza earned the nickname "Skal Tura" (Silent Beast). During these competitions, Urza always thought that Londo fought like a madman with the Coutari earning him the nickname "Paso Leati," a name that he would refer to him as throughout his life. Londo always fought well but was never really a match for Jaddo.
Jaddo joined the military and participated in the Battle of Gorash, a situation that later haunted him and left him disillusioned with military glory, even though he was hailed as a hero. Seemingly afterwards, he became a politician and attained the rank of Vocator. He began to agree with the moral scruples of Emperor Turhan that warfare was no way to build or rebuild an empire. In the late 2250s, this gradually made him powerful enemies in certain political circles, including Lord Refa.
In 2259, a resolution was drafted in the Centaurum by way of Refa that would declare Jaddo and his entire House traitors to the Republic. He traveled to Babylon 5 to ask for Mollari's help, and he happily gave it. Jaddo held a banquet for the honor, however, in conversation he learned of his old friend's connection with Refa and he was furious. The two different beliefs of the future of the Republic was fully known between them. In a last ditch effort to save his family, he challenged Mollari to the Morago, a fight to the death, knowing Mollari would not face the dishonor of refusing. He maintained the upper hand in the fight, but allowed himself to be killed. In accordance with the rules of Couro Prido, by dying in a duel to a fellow member his family became part of Londo's, sparing them a life of misery and destitution, as no resolution against his family could now harm them. He made his plea to Mollari as he died, and Mollari accepted.
- Urza's sole appearance was in Knives, though his death would have repercussions for Londo, especially regarding his alliance with Refa.
- Urza's accent (and by extension Londo Mollari, and Antono Refa's) is characteristic of Centauri Prime's northern province and is generally indicative of the "old school" of court nobility.