Well, Edmund Mills Hann lived with his large family in Oaklands at the end of the nineteenth and beginning of the twentieth century. A mining engineer and director of the P.D.S.C.Co., who originally came from Hatton, Durham, he was hugely influential in the South Wales coalfield.
See
http://tinyurl.com/ak8dv9w

There were many members of the Hann family who lived in Aberdare over the years. For example Edmund Lawrence Hann, son of the above lived at Ysguborwen House, and was Managing Director and Chairman of the Powell Duffryn Steam Coal Co. Ltd., the Rhymney Iron Co. Ltd., and Great Western Colliery Co. Ltd.; and was a Director of the Taff Merthyr Steam Coal Co. Ltd. Member of Council of the Institution of Mining Engineers, etc etc.

E.L. Hann forged the merger of PD with Welsh Associated Collieries to create the most powerful company in British coal mining.

Quite a family! Needless to say they became rather wealthy!