During the War of Heroes, Gautier was one of the Ten Elites who fought alongside Seiros, the Four Saints, and the Adrestian Empire against the forces of Nemesis. Gautier bore the Crest of Gautier, a blessing from the Goddess, and wielded the legendary weapon Lance of Ruin. After the war, Gautier founded House Gautier in the northern region of Faerghus.
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In truth, Gautier and the other Ten Elites were allies of Nemesis, not Seiros. After Seiros prevailed over Nemesis and the Adrestian Empire completed its conquest of Fódlan, the Church of Seiros revised history. Gautier's descendants became nobility of the Empire and later, the Holy Kingdom of Faerghus, passing down his Crest through the centuries.
In Imperial Year 1185, if Claude was sided with, a warrior named Gautier served as one of the ten commanders of the army of Nemesis, who had been revived by the technology of Those Who Slither in the Dark. While Claude dismissed the idea that this Gautier could have been the revived original, the fact that Nemesis himself was revived lends credence to the possibility that Those Who Slither in the Dark truly did preserve the Ten Elites and restore them to life. Gautier, the other Elites, and Nemesis were ultimately defeated, thwarting the final revenge of Those Who Slither in the Dark against the people of Fódlan.
Gauthier is a name and surname of french origins. It comes from the old french Gauldheri, which means "army ruler".