Timeships were vessels constructed by the Great Houses to travel through time.
They could be ships in the traditional Earth navy sense of the word, physical objects that thrust their way through time and often space. Most timeships wore a humanoid form. (PROSE: The Book of the War) Their interior was vastly larger than their exterior. The Evil Renegade had a timeship which had a large trophy room in its interior. (PROSE: Dead Romance) Ships of War were advanced timeships that were bred for war. The mother of them was Compassion. (PROSE: This Town Will Never Let Us Go)