A moratorium is in effect on adding information from Fire and Blood until December 20th.
High Septon (Aegon's Conquest)
His High Holiness
Father of the Faithful
Shepherd of the Faithful
|Allegiance||Faith of the Seven|
|Died||In 11 AC, at Oldtown|
The Sons of the Dragon (mentioned)|
The World of Ice & Fire (mentioned)
A Feast for Crows (mentioned)
When news of the landing of Aegon and his sisters on Westerosi soil reached Oldtown, the High Septon locked himself away within the Starry Sept in Oldtown and fasted and prayed for seven days and nights, seeking guidance from the gods. He took no nourishment but bread and water during his fast. When he emerged he announced that the Faith would not have them oppose the Targaryens, because the Crone had shown him that to do so would mean the destruction of Oldtown in dragonflame.
Lord Manfred Hightower, a pious man, heeded the High Septon's prophecy and kept his forces at Oldtown. When Aegon marched south towards Oldtown, Manfred opened his gates and submitted to Aegon's authority. The High Septon anointed Aegon with the seven oils and crowned him as King Aegon I at the Starry Sept three days after his arrival. These acts displeased many among the Most Devout, who had previously expected the High Septon to speak out against the Targaryens.
A Feast for Crows
The new High Septon mentions this High Septon to Cersei Lannister during their meeting in the Great Sept of Baelor. He tells her that Lord Manfred Hightower heeded the High Septon's prophecy. He informs her that he must go pray and fast as the High Septon had done three hundred years ago. When Cersei asks him if it will be for seven days and seven nights he replies that is will be for as long as need be.
I must do as he did, three hundred years ago. I must pray, and fast.