Buller belonged to the junior branch of a Somerset family which established itself in Cornwall during the early sixteenth century.
In 1597 Buller was admitted to the Middle Temple, and bound with his cousin Thomas Williams. While not known to have become a barrister, he subsequently held a legal position in Cornwall, and retained chambers at the Middle Temple in 1627.
At the 1620 general election, Buller used his influence as recorder of Saltash to secure one of the borough’s seats for Sir Richard Smythe’s brother, Sir Thomas. He himself was returned at St. Germans with the backing of his Kekewich cousins.
In 1627 Buller was described as a former servant of the duke of Buckingham, though no other details survive. In January 1625 he was one of several Cornish j.p.s who were warned about non-payment of composition for purveyance, but he co-operated with the collection of the Privy Seal loan later that year.
Buller’s performance in the 1626 Parliament suggests that he was now aligned with the anti-Buckingham alliance orchestrated in Cornwall by William Coryton*, his immediate superior in the Stannary courts, who had been actively cultivating his friendship since 1625.
Nevertheless, Buller’s temporary disgrace created an opportunity for Buckingham’s West Country agent, Sir James Bagg II*. In March 1628 Buller was once again elected to Parliament for Saltash, but the borough’s mayor, Bagg’s ‘friend’, secured the other burgess-ship for the duke’s nominee, Sir Francis Cottington. Moreover, Buller’s own return was not a foregone conclusion; for the first time, and in contrast to the treatment accorded to Cottington, his name was inserted after the election indentures were drawn up.
Restored as a deputy lieutenant in 1629, Buller nevertheless obstructed the government’s militia reforms. As sheriff of Cornwall in 1636-7 he succeeded, with some difficulty, in collecting his full quota of Ship Money, but his recalcitrant streak resurfaced in 1639, in his opposition to the First Bishops’ War.
