One might say that the formation of the Brotherhood rewrote the course of history. The Brotherhood was formed in 2275 A.D. by the first Cardinal, Nathaniel Durand, following the end of the First Corporate Wars. Its foundation drew all the corporations together in unity. A new calendar was begun in the year of the Cardinal's inauguration and dates were henceforth written as Y.C. -In the Year of the Cardinal.
The power of the Brotherhood quickly grew as thousands flocked to the rallying cry of the Cardinal Durand I but it was to be another fifty years before the position of the Brotherhood, as supreme power in the solar system, was irrevocably established. For in the year 51. Y.C. the Dark Legion fell upon mankind. There is no question that it was the presence of the Brotherhood that saved mankind in that terrible time. Without their guidance and spiritual fortitude mankind would not have been able to resist the dreadful fear and corrupting despair that are the Dark Legion's most effective weapons.
It was also the Brotherhood, led by Cardinal Durand I himself, that led the combined forces of humanity to their victory against the Dark Legion during the Venusian Crusade. Since those glorious and tragic times the power and influence of the Brotherhood has grown to include far more than just the spiritual well being of humanity. They are now a vast worldly power, almost a Megacorporation in their own right. They certainly have the resources to qualify but their prime directive remains spiritual and not commercial and thus they are set apart from the other corporations.
The Brotherhood was weakened somewhat by the divergence of Mishima some three centuries ago and more recently by the open defiance of Cybertronic. Now, in the bloody turmoil of the Second Corporate Wars, their diplomatic skills are stretched to the limit. But with the reemergence of the Dark Legion their star is rising once again. Because, with all other things aside, when it comes to combating the evil of the Dark Legion, The Brotherhood remains humanity's best and only hope for victory and survival before the power of the Dark Soul.