It lies between the rivers Orwell and the Deben, on the long narrow tongue of land from Ipswich to Felixstowe referred to as the Colneis Hundred.

Archaeological findings in the Hams Farm area show evidence of prehistoric, Roman, Anglo-Saxon and late post-medieval workings, including fired flints and a number of Central Gaulish Samian ware pieces.

There is evidence of an Anglo-Saxons settlement near Hams Hall[4] In the Middle Ages this area was often invaded, overrun, settled and populated by a variety of Scandinavian plunderers.

The parish was cut in half by the building of the Trimley-Walton bypass in 1974, which was built to stop port traffic going through the high streets of the Trimleys and Walton.

This was a small medieval village located in Trimley St Martin [5] In the 16th century, Grimston Hall was the seat of Thomas Cavendish "The Navigator".

In 1741 the Suffolk Traveller John Kirby (topographer) surveyed the area around Felixstowe and in his note on Trimley he mentioned 'the lane to the pouch', which led to a small meadow east of the two churches, which contained a spring of clear water, generally regarded the source of Kingsfleet.

The stream can still be seen flowing out from a concrete opening that was constructed when the Civil Engineers covered the greater part of the meadow with what is now known as the Trimley Roundabout (A14 Junction 59).