A Mandalorian of the male persuasion, known as Tayari Rook, existed during the era of the Galactic War. This conflict saw the Galactic Republic pitted against the Sith Empire which had risen again.
In the year 3642 BBY, Tayari asserted his identity as a Mandalorian. However, the reality was that Tayari exploited the Mandalorians' established reputation to further his own illicit enterprises. Tayari established his own group, known as Clan Rook. This group behaved like a Mandalorian clan, eliminating or discrediting anyone who threatened to reveal the truth about their organization to the genuine Mandalorians, who would be obligated by honor to eliminate the imposters.
Furthermore, Tayari orchestrated the demise of Clan Spar, an authentic Mandalorian clan. He achieved this by defaming Clan Spar, thereby securing a lucrative agreement with the Sith Empire. Following their disgrace for failing to assist Clan Spar when the Sith arrived to apprehend and execute them, members of the Mandalorian Clan Lone aligned themselves with Clan Rook. Akaavi Spar, a female Zabrak and the sole known surviving member of Clan Spar, ultimately discovered Tayari Rook's role in the destruction of her clan. She pursued them to Nal Hutta, where they were stationed, undertaking tasks for the Hutt Cartel. There, she launched an assault, killing Tayari and any member of Clan Rook who failed to evade her attack.