The Kingdom of Tanur (also referred to as Vettathunadu, Vettam, Tanur Swaroopam, and Prakashabhu; or the Kingdom of Light) was a feudal principality on the Malabar Coast of the Indian subcontinent during the Middle Ages. It was governed by the Tanur dynasty, a Hindu ruling family that claimed Kshatriya status. The kingdom encompassed parts of the coastal taluks of Tirurangadi, Tirur, and Ponnani in present-day Malappuram district, including locations such as Tanur, Tirur (historically known as Trikkandiyur) and Chaliyam. The kingdom also contained the coastal villages of Kadalundi and Chaliyam in the southernmost region of Kozhikode district.
The rulers of Vettathunadu were long-standing feudatories of the Zamorin of Calicut. With the arrival of the Portuguese on the Malabar Coast, the Vettathunadu kings began to manoeuvre between the Portuguese and the Zamorin. They were among the first vassals of Calicut to stand up against the Zamorin with Portuguese support. In 1546, Francis Xavier visited Tanur and the Keraladeshpuram Temple located there.