The Alvarez Empire is the main antagonistic faction of the eponymous Alvarez Empire arc in the Japanese manga series Fairy Tail.
After the restoration of the Fairy Tail Guild, the members begin construction of their new building where their old building once stood. Several ideas to locate the Sixth Master are proposed; however, a typical brawl erupts between the guild members, only to be easily broken up by Erza. Levy instantly notes down Erza as the Seventh Guild Master, much to the latter's surprise, and the approval of a member nobody seems to remember: Mest Gryder. Revealing that their former Master is in a dire situation, he leads Erza to the concealed Lumen Histoire, forbidding anybody else from following. The rest of Team Natsu promptly trails them, blowing their cover only upon witnessing their Guild's greatest secret. Overlooking their disobedience, Mest shares his memories of his undercover mission in the Magic Council. His main objective was to gain intelligence about the home of the Alvarez Empire to invade Ishgar in X781 to obtain Lumen Histoire, but were dissuaded by the threat of Etherion and Face. However, the aftermath of Fairy Tail's war against Tartaros left Makarov to disband Fairy Tail to protect the members in order to negotiate with their authorities and stall them as long as possible.
The Alvarez Empire was founded at an unspecified time before X781 by Zeref Dragneel, who subjugated 730 guilds of Alakitasia by martial force and crowned himself Emperor by the name of Spriggan. It started out as a small nation until it finally became the huge empire that it is today. Zeref created this empire for the sole purpose of annihilating Ishgar. His plans regarding with Fairy Heart once captured are going back in time in order to undo all the damage he caused.