According to Magennis, Boyle "had created a remarkable rise in fortunes for his branch of the Cork family, coming from minor beginnings to create an electoral interest and landed estate which survived him". For several decades, Boyle dominated Irish politics, amassing a large following in Ireland's Parliament which by 1753 amounted to forty
members of parliament. Though he owned properties in both Castlemartyr and Dublin, several contemporaries noted that Boyle preferred to spend most of his time residing in the family estates, ascribing it to Boyle's "bucolic indifference". Through his extensive skills in political patronage and managing elections, Boyle eventually rose (in Magennis' view) to be "the most effective undertaker or Irish parliamentary manager before 1800." In Parliament, Boyle's interests were based largely in part on his family connections; one of the earliest such connections Boyle forged was with a distant family relative
Alan Brodrick, 1st Viscount Midleton, who frequently supported him during Boyle's early election campaigns. By the 1730s, Boyle had become one of the most important officials in the Dublin Castle administration. Boyle married his first wife Catherine Coote in 1715; they had no children before she died on 5 May 1725. On 22 December 1726, he remarried
Lady Henrietta Boyle, a distant cousin who was the daughter of the
2nd Earl of Burlington. Together, the couple had five sons and a daughter before Henrietta died on 13 December 1746. Three of Boyle's sons died young, and the eldest surviving one,
Richard, succeeded to his father's titles in December 1764. In his
will and testament, Boyle named Richard as the heir to his estates. Another son,
Robert, joined the
Royal Navy. In addition to his renovation efforts at Castlemartyr, Boyle also undertook similar projects at the 2nd Earl of Burlington's Irish estates, who entrusted him with the responsibility of managing them. Anglo-Irish historian
Sir John Thomas Gilbert noted in the
Dictionary of National Biography that Boyle's efforts there "much enhanced their value, and [he] carried out and promoted extensive improvements". In 1744, Boyle commissioned English painter
Stephen Slaughter to paint an
oil-on-canvas portrait of him, which as of 2021 resides in the
Palace of Westminster collection. ==References==