In 2333, the Excalibur was under the command of Captain Shastakovich and was part of the task force organized to fight an unknown vessel attacking Federation vessels. (Star Trek: Stargazer novel: Enigma)
The vessel was captained for several years by Captain Morgen, the hereditary ruler of the planet Daa'V, until Morgen returned home in early 2367 to assume the planetary throne after the death of his father. (TNG novel: Reunion)
In early 2368, while the vessel was "in between" captains, Commander William T. Riker briefly commanded the ship during the brief Klingon civil war. Lieutenant Commander Geordi LaForge served as Riker's first officer. (TNG: "Redemption").
Following the Klingon civil war, command of the Excalibur was given to Captain Morgan Korsmo, following the destruction of his previous vessel, the USS Chekov, by the Borg in late 2367. Lieutenant commander Elizabeth Shelby, following Korsmo from the Chekov, was assigned to the Excalibur as First officer. (TNG novel: Vendetta; Tales from the Captain's Table: "Pain Management").
- (The computer game Starship Creator: Warp 2 depicts Korsmo in command of the Excalibur as early as 2362. This is in contradiction with Korsmo's command of the Chekov.)
In 2369, the Excalibur stopped at Starbase Deep Space 9 before embarking on a diplomatic mission to Vigan Delta V. Later that year, the Excalibur encountered Borg cube 45208 and a number of Excalibur personnel were assimilated, including Lieutenant Marika Willkarah, who had served on Excalibur for just over a year. (VOY novel: Distant Shores: "Brief Candle"; DS9: Stowaways; Star Trek: New Frontier: No Limits: "Making a Difference" )
Captain Korsmo was killed in battle against the Borg on stardate 50391.5, in the year 2373. His last order to Commander Shelby was to see to the safety of all hands. ("Making a Difference")
In the Pendragon timeline, following Captain Korsmo's death in the Battle of Sector 001, Elizabeth Shelby was promoted to Captain and given command of the Excalibur. Captain Shelby followed her former commanding officer's lead and supported Admiral James Leyton during the Federation Civil War.
- USS Excalibur (NCC-26517) article at Memory Alpha, the canon Star Trek wiki.
- USS Excalibur (NCC-26517) article at Memory Beta, the non-canon Star Trek wiki.