From A Wiki of Ice and Fire
True Heart was a warship belonging to Daeron Velaryon.
True Heart was part of a great war fleet sent to put an end to the rogue Racallio Ryndoon and his piratical kingdom in the Stepstones. The royal fleet—comprised of the eight new warships and some twenty older cogs and galleys—was commanded by Ser Gedmund Peake and augmented by Lord Alyn Velaryon's fleet, some sixty war galleys, thirty longships, and more than a hundred cogs and great cogs.
While Lord Alyn's attack against the Braavosi fleet was complete, he did lose three ships in the Stepstones, amongst them the True Heart with his cousin, Daeron Velaryon.
- ↑ 1.0 1.1 1.2 Fire & Blood, Under the Regents - War and Peace and Cattle Shows.