My great great great grandfather William Moss was born in 1795 in Adderbury, Oxfordshire, England. I believe that he was married twice, once to a Sarah by which he had two children Caroline b1818 and William:b1820. My guess is, that Sarah died in childbirth in December 1820. William then went on to marry Emma Elfred, who was born in 1805 also in Adderbury. They had nine children, one of which was Martha who became my great great grandmother. I'm trying to establish the surname of Sarah and the marriage dates of both Sarah and Emma.
Any help or guidance would be much appreciated.