Kaylar

The Kaylar are a caste of Rigellians from Rigel VII.

After centuries of specialist breeding the Kaylar developed to be quite different from the average Rigellian, being a good deal taller and stronger. Historically the Kaylar played a major part in Rigel's warlike society. In the 2250s when Rigel sought to join the United Federation of Planets the Kaylar faced being disbanded as Rigel attempted to move its society forward from its warlike routes. The Zemtar fortress a traditional Kaylar barracks was to be the site of the Rigel’s admission ceremony.

However, Rigel VII did not join the Federation due to a Kaylar uprising on the eve of the planets admission. The Kaylar attacks lead to the deaths of three of the crew of the USS Enterprise and injuries to seven others. (EV comic: Our Dearest Blood)

The memory of the Kaylar attack was used by the Talosians when they held Captain Christopher Pike of the Enterprise captive. (TOS episode: The Cage)