Traveling to Ireland with Olcott's crew that included leading lady and principal screenwriter, Gene Gauntier, and actor Robert Vignola, George Hollister shot The Lad From Old Ireland plus a number of film shorts in Blarney Castle, Glengarriff and at the Lakes of Killarney.
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An Irish land surveyor named John Sidney O'Brien, named Killarney Lake (before that, it was called Oak Lake by the aboriginal people) after the Lakes of Killarney, in Ireland.
To the south and east are the Lakes of Killarney and to the north is the wide, flat valley of the River Laune.