Question I know who the four horsemen were and what they did but not in any detail. As I missed the episodes about them. Could you please tell me what they did were and when. With as much detail as you have.
Answer Here is a excerpt from the plot line from "comes a horseman" episode from season 5.
MacLeod knew him as Melvin Koren, a desperado who left a trail of death and fire across the Old West, but Cassandra remembers him as an evil far older. He is Kronos, leader of the Four Horsemen, mounted Bronze Age raiders who murdered, raped, and pillaged their way across two continents. Never was a band of Immortals more cruel or more feared. He destroyed Cassandra's people and she's been hunting him across the millenia. But Kronos has a different target now -- Methos.
The Bible has the four horsemen of the apocalypse.
Thanks for asking.