The Japanese-trained Rulership won the Group 1 Audemars Piguet QEII Cup at Sha Tin on Sunday.
Trained by Katsuhiko Sumii and ridden by Umbero Rispoli, the five-year-old came home ahead of Thumbs Up and Sweet Orange.
Zaidan, formerly trained by Clive Brittain, was fourth whilst Aidan O'Brien's former Irish Derby winner Treasure Beach finished in midfield under Jamie Spencer.
Trainer Sumii is best known on these shores for training Japan Cup winner Pop Rock, Melbourne Cup winner Delta Blues and Dubai World Cup winner Victoire Pisa.
