When Alauddin Khilji invaded Devagiri in 1296, its ruler was Ramchandra Dev of the Yadava dynasty. He failed to resist Alauddin’s sudden attack effectively and was forced to surrender. Later, Alauddin treated him generously, restored his kingdom as a vassal and even granted honors, strengthening Delhi’s influence over the Deccan region. ANSWER: (C) Ramchandra Dev