Pretan/prytan: Britain in Welsh. Nesoi Pretannikai- Aristotle and Ptolemy called Britain. Plato, Timaeus: Athenian laws and public offices were closely related to civic institutions, the center of which was the Prytaneum. Magistrates were called prytaneis, and every executive post prytaneia. Replace the P with a B: bretannikai/Britannica.