Daimyo series

The Daimyo series consists of three historical novels by William Morell:

1. Daimyo (1983), a story of Tonomori, a samurai who travels with Diana, an unconventional Dutch countess. They become lovers.
2. Daimyo's Revenge (1984), a continuation of the first story; it takes place with the same characters, but now in England.
3. Daimyo's Conquest (1985), another continuation mostly taking place in the Ottman Empire.

Morell has also written The Country Team, not in the series.