There is such a thing as being too accurate to the setting. For example, if I wanted a story based in 1611 I could use the way they spelled at the time.
EX:
The Uision of Isaiah the sonne of Amoz, which hee sawe concerning Iudah and Ierusalem, in the dayes of Uzziah, Iotham, Ahaz, & Hezekiah kings of Iudah.