"Turn left and then turn right."
Translation:Trowch i'r chwith ac wedyn trowch i'r dde.
It is certainly true that many maps had east at the top, although there was not actually much consistency, as discussed here.
But this word that means both 'south' and 'right' is found (as deas) in Gaelic going back to Old Irish dess which means that it goes back to before the Celtic languages split - long before maps. It is thought that orientation based on the rising sun was an integral part of Proto-Celtic culture, with huts having their doors to the east and strict protocols for where everyone slept in relation to the door.
And of course I have just used the word orientation to mean 'find your bearings' but it actually comes from the orient 'the east', based on a word meaning 'to rise'. That gives pretty strong evidence that the use of the east for measuring direction from extended well beyond the Celts.
And mathematicians still measure angles from what they call the x-axis - what everyone else calls the east.