Deacon William Knapp Sr. was born about 1564 in Ipswich, co. Suffolk, England. He signed a will in 1655. He died on 30 Aug 1658. "Winthrop Fleet..." lists death date as 30 Aug. 1659. He was a carpenter. He was also known as William Knopp. He was married to Elizabeth Reade on 27 Sep 1584 in Bures, co. Suffolk, England.

Elizabeth Reade was born about 1563 in Bures, co. Suffolk, England. She died on 8 Jul 1593 in Bures, co. Suffolk, England. She was also known as Elizabeth Reade. Children of William Knapp and Elizabeth Reade were:

i. Deacon William Knapp Jr. died on 25 Sep 1676.
ii. Rose Knapp was baptized on 22 Feb 1589/90 in Bures St. Mary's, co. Suffolk, England. She was buried on 5 Mar 1633 in Bures, co. Suffolk, England.
iii. Elizabeth Knapp.

Deacon William Knapp Sr. married second Judith Tue on 11 Jan 1607 in Wormingford, co. Essex, England.