In 1641 there was a glass house at Greenwich owned by Jeremy Bago and Francis Bristow. This glass house contravened Sir Robert Mansel's monopoly and they were ordered to close down, but defied this order and continued working until the House of Lords caught up with them and they were jailed in 1642. John Evelyn, a diarist, states that in June 1673 he "went with friends to the formal and formidable camp at Blackheath and thence to the Italian glass-house at Greenwich, where glass was blown of finer mettal than that of Murano at Venice". At that stage the glass house was probably still owned by the Duke of Buckingham, who had a patent for making crystal glass in 1663 for the period of fourteen years. It is probable that this patent ran most of its course. Jeremy Bago had married Susanna Henzey (from a well-established glass making family) in Oldswinford in 1619 and he had returned there by 1650. Francis Bristow had been involved in a range of different glass houses, including one in Coventry in 1621. Greenwich was not mentioned by Houghton in his list of glass houses in 1696, so it probably closed in the 1670s when it could not compete with the new 'flint' glass.