HMS Theseus was a Nike-class battlecruiser of the Royal Manticoran Navy.

Completed in 1921 PD and first commanded by Captain Filipa Alcoforado, the ship was assigned to Battlecruiser Squadron 106, and sent to the Talbott Quadrant. Serving as flagship of Commodore Shulamit Onassis' second division, it fought in the Second Battle of New Tuscany and the Battle of Spindle. (SI2, HH12)

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