Illustrious

in an alternate timeline in which Khan Noonien Singh won the Eugenics Wars, the Earthfleet Starship Illustrious was a dreadnought-class battleship serving as the flagship of the Khanate of Earth during the late 24th century. The ship and its commander also known as The Khan's Dagger.

History
Khan Imperator Tiberius Sejanus Singh gave Picard Sector 221-G to rein in the rebellious alliance of Thallon, Xenex and Danter, which had previously destroyed several Earth ships. Through the application of sheer brutality, Picard made the rebels surrender unconditionally.

When the Third Khan received word that the Defiance had found the long-lost SS Botany Bay in 2376, he orderd the Illustrious to make maximum warp speed to rendezvous with the Defiance to take over the DY-102. Two hours before the Illustrious arrived at the Ajir system, Princeps Senior Picard sent a message to Princeps Julian Bashir to stand down his command. Bashir allowed the Botany Bay to escape before Picard's arrival.

Due to the fact that Picard was in command of this ship in 2376, it is VERY possible (and quite possibly, if at all likely) that this ship is a counterpart to the Federation starship USS Enterprise-E, due to the two ships being in service at the same time, and having the same commander.