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Robert Lugar (1773 – 23 June 1855), was an English architect and engineer in the Industrial Revolution.
Although born in Colchester, England, Lugar carried out much of his most important work in Scotland and Wales, where he was employed by several leading industrialists to design grand houses such as Balloch Castle (1808), Cyfarthfa Castle (1824). The Rectory in Yaxham, Norfolk, which is now known as Yaxham House, was designed for Rev John Johnson (1817), with its mirror image later used for Ffrwdgrech House in Brecon (1828). He also designed Bardon Hall (1837) in Leicestershire. Archibald Simpson worked for Lugar in his Holburn office from 1810.