The Theriad

The Theriad is an epic poem from the plane of Theros that compiles the stories of an unknown number of champions of the sun god Heliod. The tales range from centuries of Theros's past, with some widely believed to be prophetic of future Champions of the Sun. Excerpts from the Theriad are related through flavor text on vanilla cards throughout the Theros block. Additional excerpts are found on cards in the Theros Beyond Death expansion set.

Excerpts
There are fifteen excerpts in total from the Theros block. There is at least one extra excerpt in Theros Beyond Death. These are arranged in an estimated chronological order.

The Champion of the Sun

 * Kelly Digges revealed that the Champion isn't one person, but rather a title given to someone chosen by the sun — by Heliod himself.
 * One of the Champions was female, fought with a single spear, and lived on Theros from at least a young age.
 * One of the Champions was part of a boat crew with Kaliaros, the helmsman, and Photine her captain.
 * Althemone and Brygus the brave were among her companions during one of the Champion's travels.
 * Kytheon Iora became the Champion of the Sun when he received Heliod's spear to battle Erebos's Titan.
 * Elspeth Tirel became the Champion of the Sun when she took up Godsend to kill Xenagos, and her representation on the card Elspeth, Sun's Champion.

Trivia
Although The Theriad shares a similar name to the epic poem The Iliad, written by Homer near the end of the 8th century BC, the Theran analogue (in both structure and subject) to the Illiad, which covers the Trojan War and includes numerous anecdotes of other myths, is the epic poem entitled The Akroan War.