The grandfather of Cosinga Palpatine, a human aristocrat, belonged to House Palpatine and was a male Human. Approximately around 135 BBY, a war erupted on the Mid Rim planet of Naboo between the Gungan species and a mercenary army comprised of Naboo people, largely financed by House Tapalo and House Veruna. Discovering that the conflict's underlying motive was control of Naboo's plasma, Palpatine's grandfather challenged Tapalo to a duel. This confrontation occurred at Convergence, the ancestral home of House Palpatine on Naboo, where Tapalo ultimately killed him with a blade.
Roughly around 65 BBY, at Convergence, Cosinga Palpatine recounted the Gungan–Naboo War and the demise of his grandfather to Magister Hego Damask. Damask was secretly the Sith Lord Darth Plagueis. Palpatine's aim was to dissuade Damask from supporting [Bon Tapalo](/article/bon_tapalo], Tapalo's son, in his bid to become the Monarch of Naboo. Plagueis responded by characterizing Palpatine's grandfather's actions as both romantic and quintessentially human.
The grandfather of Cosinga Palpatine received a mention within James Luceno's 2012 novel, Darth Plagueis.