The Master of Masters had six apprentices. He gave five of them a Book of Prophecies. One of the apprentices turned on the other four, becoming a traitor to them.
Ansem the Wise had five apprentices, gaining six when Xehanort came along. Xehanort was forbidden from performing his experiments, like the sixth foreteller wasn't given a Book of Prophecies. Braig betrayed the other four apprentices, like one of the Foretellers betraying the others.
The Master of Masters had six apprentices. He gave five of them a Book of Prophecies. One of the apprentices turned on the other four, becoming a traitor to them.
Ansem the Wise had five apprentices, gaining six when Xehanort came along. Xehanort was forbidden from performing his experiments, like the sixth foreteller wasn't given a Book of Prophecies. Braig betrayed the other four apprentices, like one of the Foretellers betraying the others.