"Bánk bán" is a Hungarian opera composed by Ferenc Erkel in 1861. It is based on a historical drama that tells the story of Bánk bán, a nobleman who faces personal and political turmoil in medieval Hungary. The opera explores themes of love, betrayal, and loyalty, set against the backdrop of the struggle for national identity. The plot centers around Bánk bán's conflict with the foreign ruler, Gertrúd, and his internal struggle after the death of his wife, Melinda. The opera is significant in Hungarian culture and is often performed to celebrate national pride and heritage.