system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How did Slave 1 get its name?
gpt
Legend has it that Jango was sold into slavery to the governor of Galidraan after he and his True Mandalorians were defeated by a group of Jedi led by Master Dooku. After two years as a slave on a spice ship, an attack by pirates let him escape. 

When he lost his ship, Jaster's Legacy, he commandeered a prison's patrol ship (destroying the only other 5 of that class), and eventually renamed it - perhaps in memory of his own slavery - as Slave 1.