Scholars have also noted Indo-European parallels to the wolves Geri and Freki as companions of a divinity. 19th century scholar Jacob Grimm observed a connection between this aspect of Odin's character and the Greek Apollo, to whom both the wolf and the raven are sacred. Philologist Maurice Bloomfield further connected the pair with the two dogs of Yama in Vedic mythology, and saw them as a Germanic counterpart to a more general and widespread Indo-European "Cerberus"-theme. Speidel finds similar parallels in the Vedic Rudra and the Roman Mars. Elaborating on the connection between wolves and figures of great power, he writes: "This is why Geri and Freki, the wolves at Woden's side, also glowered on the throne of the Anglo-Saxon kings. Wolf-warriors, like Geri and Freki, were not mere animals but mythical beings: as Woden's followers they bodied forth his might, and so did wolf-warriors."