In the year 1200 Saint Dominic planted a seed from a sour orange in the garden of Saint Sabina Convent in Rome, Italy. Some year back Sister Mary sent me a seed taken from an orange of the Saint Dominic tree. My tree is now fruiting, and if anyone would like a seed to grow a descendant of the famous tree, send me a private message with your address. - Millet
http://medmeanderings.com/travel/2014/08/legend-saint-dominics-orange-tree/