He became one of the pioneers who laid the foundation of British Trade and prosperity and by his industry he was granted an export licence by Charles II to export horses, bred on the Hellaby estate, to Barbados to turn the mills to crush the sugar cane and in return sugar was imported into the district through the Port of Hull. By 1700, exports from Barbados exceeded in value those of all North America together. He named the highest mount in Barbados, which happened to be on his estate, "Hillaby Mount". He is thought to have owned a large part of Philadelphia and he was appointed Chief Justice of Court Justice of Court of Common Pleas in Barbados. In 1671 he became a Quaker and in 1674 was removed from office because of his beliefs. Numerous prosecutions followed for allowing negroes to attend religious meetings in his house, for not paying church dues and for not carrying out Militia duties. Ralph Fretwell returned to Hellaby around 1688 and commenced building of the present hall, farm and cottages. Completed in 1692, the Hall was designed in the Jacobean style. The doorway having an open segmental entablature on Tuscan Pilasters. Gables on each side with big, fleshy volutes rising in slopes and curves to a flat top. Three sides of the hall are built of coursed magnesium limestone from local quarries and the front, faced with Roche Ashlar. With a Dutch impression that was influenced by the style common in the colonies, the Hall was built on a hill and hence an extra storey was required to obtain the height at the front elevation. Ralph Fretwell did not get on well with his wife and so returned to Barbados after the Hall was finished in 1692 and died there in 1701. In the inventory of his goods at Hellaby (which accompany his will in archives at York) he left £5000 to each of his three daughters, as well as the Hellaby Estate. The younger daughter died before the age of eleven years, the youngest, Mabel, married Dr Samuel Swyfen of Lichfield in 1710. Swynfen was the godfather of Dr Samuel Johnson and Mabel eventually became the housekeeper of Dr Johnson. The eldest daughter, Dorothy married John Pyott, and it was to her that the estate and adjoining farmlands, descended. The daughter of Dorothy and John Pyott, also named Dorothy, married Peter Johnson,