The son of Abraham Alsop of St George, Glos., yeoman, and brother of Uriah Alsop I (A, Ao).
| 1774 | 8 May. Probably the James Alsop baptised at St George, the son of Abraham and Sarah Alsop (Ancestry website). |
| 1788 | 10 Sep or 10 Nov. Apprenticed to James I and Hannah Alsop (A, Ao). |
| 1802 | 6 Jul. Free potter (F). |
The following could apply to either James Alsop I or III.
| 1803-05 | Brown stone potter, Temple Street, Temple parish (MD). (Possibly a mistake for St Thomas Street) |
| 1805 | He stood surety for Philip Tanswell to keep an alehouse in Temple parish (AKL). |
| 1805 | Potter, Thomas Street (Holden’s D). |
| 1806 | James Alsop & Co., brown stone potters, Temple Street (MD). (Possibly a mistake for St Thomas Street) |