There are indeed several indications that the sea level has been more than a foot higher in recent history:
If the port was bustling 2000 years ago it is reasonable to suppose that tidal access was less
limited then than it is today-or was at least as good. Consequently the evidence suggests that
in 350BC there was probably a little more water than exists today in order for it to be a
worthwhile place to ship cargo from, and therefore current ocean volume (glacier melt and
thermal expansion) is less now than then, to take into account the known land changes.
“The North Sea had a nasty little jump between 350 and 550AD, flooding the coasts of
northern Europe with an extra 2 feet of water and sending its inhabitants — folk known
as Angles and Saxons — fleeing (although “conquering” might be the better word) into
ill-prepared Roman territories.
The results
indicate that during the Byzantine period, sea level at Caesarea was higher by about 30
cm than today. The Late Moslem and Crusader data shows greater fluctuations but the
data sets are also much smaller than for the earlier periods.”
Wave-cut notches along the seaward shoreline confirm a site-specific
rheological model for the northern the Red Sea that indicates a sea-level highstand (~1
m above present MHW) during or immediately prior to occupation. ... etc.
Quotes from here - click for citations.
http://curryja.files.wordpress.com/2011/07/document.pdf