Maud Heath, who owned land and houses both in Langley Burrell and in Chippenham, was concerned that the people of Bremhill, Foxham, Tytherton and the Langley area had a difficult passage through marshy and flooded land to Chippenham Market. On 12th June 1474 she made a deed of gift of land and houses worth £8 in rents per year to a trust to build a causeway from Wick in Bremhill to Chippenham. This 4.5 mile causeway of cobblestones passed over land at Kellaways that was a swamp during the winter months.
In 1698 the Maud Heath Trust erected the 12 foot high monument by the river at Kellaways. This features a three faced block sundial with Latin inscriptions.