Udayanacharya (c. 10th–11th century), who flourished near Darbhanga, was a major logician who worked to reconcile the Nyaya and Vaisheshika schools and to defend a theistic philosophy. His Kusumanjali and Atmatattvaviveka became classics of Indian logic.
His work laid the ground for the great flowering of logic in Mithila that would culminate, generations later, in Gangesha’s “New Logic”.