There was no normal size for an infant town.

Some, when first established, covered little more than 30 acres, the area of mediaeval Warwick.

Others were four or five times as spacious; they were twice or nearly twice as large as mediaeval Oxford, no mean city in thirteenth-century England.

Most of them, doubtless, grew beyond their first limits; a few spread as far as a square mile, twice the extent of mediaeval London.

Similarly the 'insulae' varied from town to town.