John Dillwyn Llewelyn

John Dillwyn Llewelyn was the squire of Penlle'r-gaer. In 1833 he married Emma Thomasina Talbot (1806-1881), a cousin of William Henry Fox Talbot, the inventor of the negative-positive photographic process. During his tenure at Penlle'r-gaer he landscaped the grounds, creating two lakes, and building orchid houses and an observatory. He became an enthusiastic and proficient photographer and invented the Oxymel process.