When and where was the first game of lawn tennis played?

Around 1873, a patented game sprang out of nobleman's party mood one dreary day in Wales.
http://www.driftwaycollection.com/history_1.html

A Colonel Mainwaring claimed that lawn tennis was the old Welsh game of Cerrig y Drudion.

A Major Walter Wingfield claims to have found the answer, to transporting the "indoor game" outside, on the green, manicured lawns of his home at Nant Clwyd, not too far from the village of Cerrig y Drudion, in North Wales.
Major Wingfield's version used the traditional hourglass shape of a badminton court. The All-England Croquet Club at Wimbledon changed it to a rectangle 26 yds long by 9 yds wide.

The game of Cerrig y Drudion - I can only so far find reference to this in this speech of Colonel Mainwaring. Cerrig y Drudion is a very old established place in North Wales, and I am rather of the opinion that this is either a fake speech, or that the colonel was being less than serious when he made it. As always, I sit to be corrected (too tired to stand).