Daily entries from the 17th century London diary
According to Lattham & Matthews, this was either Theatrum civitatum … Italiae or Urbium praecipuarum mundi theatrum quintum, two out of six volumes of engravings published in Cologne, 1572-1618. Pepys seems to have confused the titles.
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Pepys might have been correct,
another possibility is:-
Novum ac magnum theatrum urbium Belgicae …
Amsterdam: Jan Blaeu, 1649. 2 vols., fo.
This would be consistent with viewing the “Flandria Illustrata” at the same time.