Dowse’s great-grandfather settled at Tichborne, Hampshire, and the family acquired the manor of Chilworth, in the same county, in the 1530s. His father, Thomas, married a cousin of Sir Walter Covert* of Slaugham, Sussex, and at his death in 1601 he disposed of inherited or purchased estates in Wiltshire, Hampshire and London.
Dowse was not without Court connections, for one of his brothers, Edmund, served as a cupbearer to Anne of Denmark.
Dowse’s meagre properties in north Wiltshire were insufficient to provide him with any influence in nearby parliamentary boroughs. He may have owed his election at Cricklade in 1625 to the dominant patron of the borough, Thomas Howard, 1st earl of Suffolk, possibly on the recommendation of Northumberland’s cousin, Sir Edward Cecil*. If so it is likely that Northumberland, who had nominated Cecil for Chichester in 1621, asked the latter to find a seat for Dowse. Cecil was a close friend of Suffolk’s son-in-law, William, 2nd earl of Salisbury (William Cecil, Viscount Cranborne*) and also the uncle of Suffolk’s daughter-in-law, the wife of Sir Thomas Howard*. Moreover, Cecil himself had probably been nominated by Suffolk at Malmesbury in 1624.
Richard Montagu, the anti-Calvinist polemicist and rector of Petworth, who was on good terms with Northumberland, saw Dowse as a potential supporter. Indeed, shortly before the Parliament he described Dowse as ‘one that will speak [in the Commons], if need be’. In the event, however, Dowse made no impression upon the records of the House. The following year he was returned at a by-election for Chichester in 1626, replacing his former protégé Percy when the latter was called to the Upper House on 28 March. He again made no recorded contribution to the parliamentary proceedings.
Dowse continued to serve Percy after the latter succeeded as 10th earl of Northumberland in 1632, being described as the earl’s secretary in 1642. He was returned for Chichester to the Short Parliament, again on the Percy interest, and for Portsmouth in November 1640 at a by-election caused by the decision of his patron’s younger brother, Henry Percy, to sit as knight of the shire for Northumberland.
