Supplemented into the race earlier in the week at a cost of €100,00, the German-trained filly led home a 1-2-3 for the fairer sex as Shareta and Ed Dunlop’s Snow Fairy filled the minor places.
Ridden by Andrasch Starke, Peter Schiergen’s three-year-old sprinted clear inside the final furlong to add to her two Group One victories in her homeland.
The last German-trained Arc winner had been Star Appeal, ridden by Greville Starkey, in 1975.
Aidan O’Brien’s Irish Derby winner Treasure Beach put the pace into the race for his stablemates So You Think, who eventually finished fourth, and St Nicholas Abbey, who was one place behind in fifth.
Shareta, thought by many to be Sarafina’s pacemaker, did incredibly well to cling on for second.
Snow Fairy had the perfect trip throughout under Frankie Dettori, but could not match the winner’s turn of foot.
The likes of Sarafina, Galikova and Workforce never looked like getting involved at any stage.
Schiergen said: “This is my best moment in racing. I don’t believe it – she was such an easy winner.
“It’s fantastic and she is the best horse I have trained. It’s a great moment.
“She is a small filly with a big, big heart and there’s no better race to win.
“I have trained some Group winners, but she is the greatest filly I have ever trained. She won her last two races very easily, but I didn’t think she would be such an easy winner.”
Starke said: “It was a dream for me just to ride today in this race.
“I knew the filly could put up a great performance but there was a lot of competition in the race and good horses.
“In the last two furlongs she just gave me a great feeling and I was just dreaming.
“I don’t know what has happened. It’s a dream come true.”
Dettori said of Snow Fairy: “She ran a super race. A furlong and a half out I thought we had a big chance but when the winner kicked that was that.”
O’Brien said of So You Think: “I thought he ran very well. He was coming home very well and it was the first time he’d run over that trip for us.
“He’s a big cruiser and I think he would handle the dirt (Breeders’ Cup) no problem, but the boys will have to discuss it before we decide what to do next.”
So You Think’s jockey Seamie Heffernan said: “He had a very wide draw, so you had to make an early decision, and I wanted to make sure there was something left at the finish. I thought it was a good run.”