Do you want to go back 60 million years or just the recent history?
Okeetee is the name of an area that produced exceptional looking snakes. Originally, an Okeetee was a snake from that area. Now it has come more to mean a snake with wide black boarders, bright orange saddles that looks like the snakes from that area.
RO is simply an Amel with the look of an Okeetee. This is a line-bred trait and is not genetic.