Muiden is a city and former municipality in the Netherlands, in the province of North Holland. It lies at the mouth of the Vecht and is in an area called the Vechtstreek. The first known reference to Muiden is from 953 when Otto I, Holy Roman Emperor, granted the settlement and its toll rights to Cathedral of Saint Martin, Utrecht. It was called Amuda, meaning "mouth of the (river) A". "A" was the old name for the Vecht river.