http://ntgen.tripod.com/bw/alyn_index.html

• Born: Estimated 1609 in England (Estimate based on age 60 at 1669, when he was "freed from training")
• Immigration: By 1636. It's unknown if he had his family on immigration, or came single. Although we do not have any firm evidence of when his children are born, they are all thought to have been born in America, so it is possible he came single and married in the New World.
• Residences: Salem, 1636 > New London, Conn 1651
• Occupation: I've not seen him associated with a trade. Likely landowner, stockraiser, farmer.
• Spouse: Sarah, identity, birth and death data unknown. Probably mother of all of his children. Survived Robert.

Anderson, in The Great Migration Begins, speculates he may be the brother of William Allen of Salem and Manchester: "probably the brother of Robert Allen of Salem, Manchester and New London (based on joint grant of land on 25 January 1642/43, and the simultaneous residence in Manchester [see Granberry 146 and Essex Ant 2:135]." (TGMB, p 35).

Robert Allyn, the first of that name in this country, was probably born in England about 1608. He is known to have lived in Salem. Massachusetts, in 1636, and was admitted to the church there in 1642. He was a proprietor at Jeffery's Creek in 1638 and a constable there in 1648. In March, 1651, he emigrated with the Glouster Company to New London, Connecticut, and was allotted land on Cape Ann Lane. He later, in 1656, obtained a large tract of land on the east bank of the Thames, then called the Pequod river, at a place still called Allyn's Point. This was then in the town of New London but by changes in boundaries it soon became the town of Ledyard. He was one of a company which purchased land in Norwich or "New Norridge" where he was a constable in 1669. He died in 1683 in Ledyard leaving five children by his wife Sarah--a son John, and four daughters--Sarah, wife of George Geer; Mary, wife of Thomas Park; Hannah, wife of Thomas Rose; Deborah, who afterwards married John Gager Jr.

Source: New England Families Genealogical and Memorial: Volume IV Pg 1905-6

Of New London, CT.