Men in Armour for Gloucestershire - lists all the able bodied men able to fight

http://www.coaley.net/glos1608/index.php

There is just one STEWARD - William of Cirencester A20 (age around 20) Sadler, of Lower Stature

no STUARD or STEWART

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Checking the Gloucestershire Genealogical Database

http://ww3.gloucestershire.gov.uk/genealogy/search.aspx

There is a Will of a Thomas STEWARD - 1597 - of Pebworth/Broad Marston

No early STEWART Wills

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Gloucestershire Archive Catalogue search

http://www.gloucestershire.gov.uk/archives/catalogue has over 600+ hits for STEWARD (as it's an occupation as well as a surname) - quickly looking, there is an Agnes STEWARD mentioned 1605 - again Pebworth