Trumbull’s background and early life remain obscure. Of humble Yorkshire origins, in the early 1590s he was apprenticed to an attorney, William Dudson, based at Hampton Court.
When Edmondes was transferred to Paris in 1609, Trumbull expected also to be recalled as soon as a replacement could be found. However, Cecil, now lord treasurer and 1st earl of Salisbury, economized by keeping him on as an agent at Brussels, with ad hoc letters of credence and an inadequate expense allowance. An incessant flow of dispatches ‘not of immediate consequence’ certainly reminded the overworked minister of Trumbull’s existence, but was otherwise counter-productive.
Despite his promotion, Trumbull was promptly sent back to Brussels, albeit with an increased allowance. Six years later, in April 1621, he was sent on a special mission to the Rhenish Palatinate, which lasted into the summer. As long as a Spanish marriage remained a possibility all his appeals to be allowed to come home were ignored.
Returning to England on the outbreak of war in 1625, Trumbull took up his duties in the Council chamber with characteristic zeal.
On the recommendation of the 3rd earl of Pembroke Trumbull was returned to the 1626 Parliament at a by-election for Downton in Wiltshire. He was named to two committees in which he may have taken a particular interest, one to consider a petition from a merchant plundered by the Dunkirkers for compensation out of the prizes in Dover harbour (8 Mar.), and the other for a bill to make it easier for puritan ministers to hold livings (6 May).
Following the appointment in December 1626 of a special commission to investigate the Navy, Trumbull and another Council clerk were ordered to attend the commissioners’ meetings and to keep the king and Council informed of their proceedings.
