As a younger son of one of the wealthiest families in the country, Spencer enjoyed a lengthy education at both universities and abroad, before entering the household of Elizabeth’s lord treasurer. As a protégé of the 1st Lord Burghley he was employed on a number of confidential missions, including one to James VI of Scotland in 1583, in which he behaved ‘very discreetly ... to his great praise’; and a colleague commended his ‘good, open and kind disposition’.
Having previously been returned to Parliament twice during Elizabeth’s reign, Spencer was elected for Brackley in 1604 on the interest of his brother-in-law, lord chancellor Ellesmere (Thomas Egerton†).
Having participated in the abortive peace negotiations with the duke of Parma immediately before the Armada, Spencer was a natural choice for the Madrid embassy when diplomatic relations with Spain were restored.
In the third session Spencer’s main preoccupation was with the proposed Union. He was one of those ordered to consider the instrument produced by the commissioners (29 Nov. 1606).
Spencer was back in time for the fourth session. He was named to the committee of returns and privileges (9 Feb. 1610), and on 19 Feb. moved that the Great Contract should be referred to a select committee.
Spencer did not stand for Parliament again, perhaps as a result of the shadow cast over him by the increasingly unhappy relations between his sister and her husband. In 1622 he appeared before the Privy Council to explain his reluctance to pay the Palatinate Benevolence, and eventually capitulated to give £40.
