Durbasa, the king Furu and the sage Angarai (Angiras) sang the Praises of Guru Nanak Dev. (Swayye Mahle Pahle Ke, p. 1390) The sage Angiras is said to be the author of many hymns of Rig Veda. He was one of the Sapt-rishis and one of the ten Prajapatis. It is also said that he was the father of Agni. He also agreed to become the first son of Agni. In one of the accounts it is stated that he was the son of Brahma and was born from his mind.
1. Kohli, Surindar Singh, Dictionary of Mythological References in Guru Granth Sahib, 1993