As the fifth of six brothers to survive into adulthood, St. John could hardly expect a significant inheritance from his father, who, having probably already given him a life annuity, left him only £50 in his will.
St. John was knighted at Bletsoe in July 1619, when the king was ‘nobly entertained’ by his eldest brother Oliver, 4th Baron St. John.
In 1627 St. John was made an honorary member of Gray’s Inn at the behest of the reader, Richard Taylor*, his brother’s deputy as recorder of Bedford. During the 1630s St. John handled the affairs of his nephew Sir Paulet St. John, procuring the latter’s marriage licence in 1632 and acting as trustee of his Bedfordshire estates thereafter.
