185.
A third example may be drawn from our own country.

Lincoln, the Roman Lindum, was established as a 'colonia' about A.D.75, and the lines of its original area, its 'Altstadt'-- for it was perhaps enlarged in Roman times,--can still be traced 'Above Hill' round the Castle and Cathedral (fig.

26).

It formed a rectangle just over 41 acres in extent (400 x 500 yds.).

Four gates, one of which still keeps its Roman arch, gave access to the two main streets which divided the town into four symmetrical quarters and crossed at right angles in the centre.