Known as Ord Casto prior to his rise to power, Truth was a powerful San'shyuum high prophet, responsible for both the near destruction of humanity and their eventual saving grace, the Great Schism.
HOMEWORLD: High Charity
BORN: March 15th, 2396
DIED: December 11th, 2552
SUMMARY
Ord Casto, better known as the Prophet of Truth, was born in 2396 on High Charity. He was initially the Minister of Concert and then later the Minister of Fortitude before eventually rising to the rank of high prophet of the Covenant along with the Prophet of Regret and the Prophet of Mercy. The high prophets were instrumental in starting the war with humanity in 2525, and continued to push for their destruction through the following decades. He faced his undoing in 2552 after implementing his plan to replace the Sangheili with Jiralhanae as Covenant commanders and become the only Covenant prophet by letting the other two prophets die. His plan began the Great Schism, which was key in turning the tide of the war and giving humanity the chance it needed to win. Truth made a last-ditch attempt to win the war by travelling to Installation 00 and activating the Halo array, but his actions were stopped and he was killed by Thel 'Vadam.
2462 CE
Following years of abuse of Unggoy at the hands of the Kig-Yar culminating in the sterilization of thousands via poisoning, the Unggoy Rebellion began in 2462 to protest their treatment by the Kig-Yar and the Covenant as a whole.
The Battle of the Rubble was a battle that took place in the 23 Librae system on a grouping of Lagrangian asteroids trailing Hesiod, a gas giant in the system, some time around 2535.
The Battle for Earth was a large-scale space, air, and ground battle between the invading Covenant forces and the UNSC Home Fleet on and around Earth at the end of 2552.
The Battle of Installation 05 was an engagement between the Covenant forces, including those that fled the Battle for Earth, High Charity, and the Second Fleet of Homogeneous Clarity, and the UNSC-allied forces, including the UNSC In Amber Clad led by Miranda Keyes, and the Fleet of Retribution led by the Arbiter Thel 'Vadam.
The Great Schism was a conflict between the forces loyal to the Covenant, led mostly by the Jiralhanae, and the Sangheili, beginning on November 3rd, 2552 and continuing off and on until the Rule of the Created in 2558.
The Battle of Installation 00 was a major conflict between the forces stationed aboard the UNSC Forward Unto Dawn and Arbiter Thel 'Vadam's Fleet of Retribution, and the Covenant fleet loyal to the Prophet of Truth.
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REFERENCE BOOKS

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