Pre-coronation Randor: a Captain of the Eternian Guard who defeated his half-brother Keldor in the confrontation that became Skeletor's curse.
The Captain Randor identity is the 200x MYP retroactive backstory for the future king. As Captain, Randor faced his half-brother Keldor in combat; the acid attack that destroyed Keldor’s face occurred in this confrontation. The pre-coronation form is shown in flashbacks across the 200x MYP series and revisited in the 2021 Revelation continuation.
Catalogue source: heman.fandom.com (CC BY-SA 3.0).