Jacob, an English poet of the seventeenth century, was the son of James Allestry, a bookseller of London. He was educated at Westminster School, entered at Christ Church, Oxford, in the act-term 1671, at the age of 18, and was elected student in 1672. He died young on the 15th October 1686. Some of his poems are to be found in a collection of "Miscellany Poems," published in 1721.