Hi John,
I have a Mary Marven that married Edward Syer .Her Father was John Marven of Copdock who Married a Jane Lamb. John Marven died in 1802 and Jane in 1813.Mary and Edward had children Thomas Marven Syer, John Marven Syer , a daughter unknown and Edward Marven Syer.There were Marven Syers at East Bergholt at Four Sisters farm that may have been one of these children and they are buried in East Bergholt cemetery. I also believe that Mary and Edward may have lived at what is now Westhill house ,Copdock which was once called New Hall and was said to have been built by her Father John Marven for them . Her Grandfather , also John Marven is thought to have lived at Copdock Hall and was deputy Steward of the manor . The Marvens go back to around the late 1200,s in Copdock.
Hope this helps. If i find anything else i shall let you know ,
Laurie.