Who was the maternal uncle of Nakula and Sahadeva, also joined Kaurava's Army during Kurukshetra war?

Shalya was the maternal uncle of Nakula and Sahadeva, being the brother of their mother Madri. Despite this familial connection, he was tricked into fighting for the Kauravas in the Kurukshetra war. Duryodhana had sought Shalya's support, and Shalya had to honor his promise. He eventually became the Kaurava commander after Karna's death.