Sir Robert William III de Atherton
- Born: Abt 1230, Atherton, Lancashire, England, United Kingdom
- Marriage (1): Agnes de Lancaster
- Marriage (2): Mrs. Derby about 1273 in Lancaster, Lancashire, England
- Died: Abt 1280, Atherton, Lancashire, England aged about 50
FamilySearch ID: K12C-P8Q.
Robert married Agnes de Lancaster. (Agnes de Lancaster was born about 1220 in Cadbury, Manor, Sommerset, England and died about 1271 in Bramber, England, United Kingdom.)
Robert next married Mrs. Derby about 1273 in Lancaster, Lancashire, England. (Mrs. Derby was born about 1205 in Atherton, Lancashire, England and died in Atherton, Lancashire, England.)
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