Traveller: New Rome
Traveller: Dynasty is a set of rules published by Mongoose Publishing. These rules are only vaguely related to the normal Traveller game. Instead of playing a single character in the Traveller science-fiction universe, you control an entire dynasty. Instead of moment-by-moment decisions in a character’s life, you play out decades at a time for your dynasty. In this way, you shape and create history in the futuristic setting.
The PDF is currently $14.99 on DriveThruRPG (purchase). Don’t pirate; that’s grounds for expulsion from the game. If you want to see what the rules are all about, check out this pretty thorough review on RPG.net.