The talented colt made it back to back Grade I wins when taking the 1600 metre turf feature by a head, his third win from seven starts.
Holy Roman Emperor shuttled initially to Australia in the first years of his stud career for Coolmore before switching to Brazil in South America for several seasons.
Maraton is the first South American Grade I winner for Holy Roman Emperor and is his seventh overall.
An incredibly versatile sire of sprinters and stayers, Holy Roman Emperor was making news earlier this week with his star son Mongolian Khan crowned NZ Horse of the Year for the second year in a row.
Holy Roman Emperor stands at Aquis Farm in Queensland for the very first time this year at a fee of $9,900.
News from Aquis Farm