Definition of "Iaponia"

becauſe theſe moſt worthy Chriſtiãs of Iaponia whereof this relatiõ doth entreate be of the ſame Chriſtian and Catholike Fayth and Religon[sic] that you be

1619, W. W. Gent, A Briefe Relation of the Persecution Lately Made Against the Catholike Crhstians, in the Kingdome of Iaponia, volume 1, page 6