Attested: AI iter 15 Moriduno; RC Moriduno; Peutinger Ridumo
Where: Gittisham Roman fort at SY13259930 beside the river Otter fits the distance of 15 miles from Exeter in both AI and Peutinger. The Hembury hill-fort at ST112031, or Sidmouth, on the coast, are much less likely locations.
Name origin: About -dunum ‘fortified low hill’ see here. It is often argued that *mor- was Celtic for ‘sea’, but most ancient place names derived from PIE *mori- map near inland water – marshes and lakes.
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Last edited: 28 June 2018