666 Let. Aris. 84-85 also begins with a description of walls and gates, but gives the height of the walls (as one would expect, if they are defensive) and hints at the splendour of the gates. Five plethra is about 166 yards, or 150 metres; 100 cubits is about 50 yards, or 45 metres. The dimensions suggest the importance of this sacred space for the identity of the city.