Irish bred Stroller & Marion Coakes - Stroller came to England from Ireland as a job Lot. I believe Stroller was by thoroughbred stallion who had "mór (great) blood ( Champion Sire "Flat" blood) maybe even could have had Dark Ronald blood and I believe the Irish bred Stroller  "threw" to that Great Blood in his sires side for his Atheltic ability. Strollers dam (mother - mutter) was probaldy a Connemara mare and she could have given Stroller his "carefulness" like some "Great Dams" do in International show jumping. Stroller stood only 14.2 hh or 148 cm
To me Stroller was the "Greatest Show Jumper Ever Born" that jumped a fence because of: 1. his small size to take on big, big horses more powerful than him and beat them many times and 2. To Win the 1968 Olympic Individual Silver Medal over probadly the biggest Olympic track ever built, only 4 faults (1 fence) behind The Gold Medalist "Snowbound" a full thoroughbred ex-racehorse. Plus: At the Mexico Games at "altitude"too!! Stroller had a decayed split tooth that the pus ossed out through his nose. Stroller Simply The Greatest !!