when was the first film in this series released?
2001
The Lord of the Rings (film series)
The films are subtitled "" (2001), 
who played the elf princess in lord of the rings UNANSWERABLE
wiki:19110807
The Lord of the Rings (film series) [SEP] Introduction
The Lord of the Rings is a film series of three epic fantasy adventure films directed by Peter Jackson, based on the novel written by J. R. R. Tolkien. The films are subtitled "" (2001), "" (2002) and "" (2003). Produced and distributed by New Line Cinema with the co-production of WingNut Films, it is an international venture between New Zealand and the United States. The films feature an ensemble cast including Elijah Wood, Ian McKellen, Liv Tyler, Viggo Mortensen, Sean Astin, Cate Blanchett, John Rhys-Davies, Christopher Lee, Billy Boyd, Dominic Monaghan, Orlando Bloom, Hugo Weaving, Andy Serkis and Sean Bean.