The Welsh Springer Spaniel was originated from the English springer/cocker speniel. Eventually, Renaissance hunters began to seperate the water spaniels from the land spaniels and by the late 1800s the Welsh speniel was a seperate breed from the other spaniels. Today the spaniels are still used as hunting dogs that find and spring at game. They also make good companion dogs if well trained.
http://www.dogbreedinfo.com/welshspringerspaniel.htm
http://www.akc.org/breeds/welsh_springer_spaniel/
http://en.wikipedia.org/wiki/Welsh_Springer_Spaniel