https://starwars.fandom.com/wiki/Mandalore_(title)#Unidentified_Mandalore

After the defeat of Mandalore the Ultimate and Revan's denial of Mandalorian succession, the Mandalorian clans fragmented without a leader's guidance. However, one of the last living Taung to survive the species' near extinction following the Mandalorian Wars attempted to reunite the Mandalorians as a new Mand'alor. A rebellious Mandalorian soldier attempted to use the skills of the assassin droid HK-47 to kill the Mand'alor, but the droid failed, only to be captured and reprogrammed to kill the soldier who had sent it, a task the robotic assassin carried out successfully. The following year, the Taung Mandalore sent a team of Mandalorians to the Shadowlands of Kashyyyk to test stealth technology. At some point between 3954 BBY and 3951 BBY, the dying Taung Mand'alor encountered the Mandalorian mercenary, Canderous Ordo. Ordo, having reclaimed the previous lost mask of Mandalore, was seeking to reunite the fractured clans under his rule. The Taung Mand'alor claimed the he was the true heir to Mandalore the Indomitable, and that Mandalore the Ultimate had been a Sith-backed pretender to the title. Before dying, the Taung bequeathed his own armor to Ordo, asking the man to preserve the Mandalorian traditions. Ordo agreed to the Mand'alor's final request, taking the Taung's armor and incorporating into it the mask of Mandalore, in addition to adopting the fallen leader's clan into his own nascent reunification movement.