It was the vulgar opinion that the Tower was built by Julius Caesar;
but, as I have before shown, history informs us that Caesar made no
stay in England, that he erected no town or fortress, unless that
with which he enclosed his ships on the coast of Kent, nor left a
single garrison or soldier in the island on his departure.

This Tower, as now encompassed, stands upon twelve acres of ground,
and something more, being of an irregular form, but approaching near
to that of an oblong, one of the longest sides lying next the river,
from whence it rises gradually towards the north, by a pretty deep
ascent, to the armoury, which stands upon the highest ground in the
Tower, overlooking the White Tower built by William the Conqueror,
and the remains of the castle below it on the Thames side, said to
be built by William Rufus.

As to the strength of the place, the works being all antique, would
not be able to hold out four-and-twenty hours against an army
prepared for a siege: the ditch indeed is of a great depth, and
upwards of a hundred feet broad, into which the water of the Thames
may be introduced at pleasure; but I question whether the walls on
the inside would bear the firing of their own guns: certain it is,
two or three battering-pieces would soon lay them even with the
ground, though, after all, the ditch alone is sufficient to defend
it against a sudden assault. There are several small towers upon
the walls; those of the largest dimensions, and which appear the
most formidable, are the Divelin Tower, on the north-west; and the
Martin Tower on the north-east; and St. Thomas's Tower on the river
by Traitor's Bridge; which I take to be part of the castle said to
be built by William Rufus. There is also a large tower on the
outside the ditch, called the Lions' Tower, on the south-west