Question: Who is the actor who plays the title character of The Bourne Ultimatum?

Knowledge 1: The Bourne Ultimatum
The Bourne Ultimatum is the third Jason Bourne novel written by Robert Ludlum and a sequel to "The Bourne Supremacy" (1986). First published in 1990, it was the last Bourne novel to be written by Ludlum himself. Eric Van Lustbader wrote a sequel titled "The Bourne Legacy" fourteen years later. [SEP] Knowledge 2: The Bourne Legacy (film)
The Bourne Legacy is a 2012 American action thriller film directed by Tony Gilroy, and is the fourth installment in the series of films adapted from the Jason Bourne novels originated by Robert Ludlum and continued by Eric Van Lustbader, being preceded by The Bourne Identity (2002), The Bourne Supremacy (2004), and The Bourne Ultimatum (2007). Although this film has the same title as Van Lustbader's first Bourne novel, The Bourne Legacy, the actual screenplay bears little resemblance to the novel. Unlike the novel, which features Jason Bourne as the principal character, the film centers on black ops agent Aaron Cross (played by Jeremy Renner), an original character. In addition to Renner, the film stars Rachel Weisz and Edward Norton.
Knowledge 1: The Bourne Ultimatum
The Bourne Ultimatum is the third Jason Bourne novel written by Robert Ludlum and a sequel to "The Bourne Supremacy" (1986). First published in 1990, it was the last Bourne novel to be written by Ludlum himself. Eric Van Lustbader wrote a sequel titled "The Bourne Legacy" fourteen years later. [SEP] Knowledge 2: The Bourne Legacy (film)
The Bourne Legacy is a 2012 American action thriller film directed by Tony Gilroy, and is the fourth installment in the series of films adapted from the "Jason Bourne" novels originated by Robert Ludlum and continued by Eric Van Lustbader, being preceded by "The Bourne Identity" (2002), "The Bourne Supremacy" (2004), and "The Bourne Ultimatum" (2007). Although this film has the same title as Van Lustbader's first "Bourne" novel, "The Bourne Legacy", the actual screenplay bears little resemblance to the novel. Unlike the novel, which features Jason Bourne as the principal character, the film centers on black ops agent Aaron Cross (played by Jeremy Renner), an original character. In addition to Renner, the film stars Rachel Weisz and Edward Norton.
Knowledge 1: The Bourne Legacy (film)
The titular character Jason Bourne does not appear in The Bourne Legacy, because actor Matt Damon chose not to return for the fourth film, due to Paul Greengrass not directing. Bourne is shown in pictures and mentioned by name several times throughout the film. Tony Gilroy, co-screenwriter of the first three films, sought to continue the story of the film series without changing its key events, and parts of The Bourne Legacy take place at the same time as the previous film, The Bourne Ultimatum (2007). [SEP] Knowledge 2: Bourne (film series)
Film U.S. release date Director Screenwriter (s) Story by Producer (s) The Bourne Identity June 14, 2002 (2002 - 06 - 14) Doug Liman Tony Gilroy and William Blake Herron Doug Liman, Patrick Crowley and Richard N. Gladstein The Bourne Supremacy July 23, 2004 (2004 - 07 - 23) Paul Greengrass Tony Gilroy Frank Marshall, Patrick Crowley and Paul L. Sandberg The Bourne Ultimatum August 3, 2007 (2007 - 08 - 03) Tony Gilroy, Scott Z. Burns and George Nolfi Tony Gilroy The Bourne Legacy August 10, 2012 (2012 - 08 - 10) Tony Gilroy Tony Gilroy and Dan Gilroy Frank Marshall, Patrick Crowley, Jeffrey M. Weiner and Ben Smith Jason Bourne July 29, 2016 (2016 - 07 - 29) Paul Greengrass Paul Greengrass and Christopher Rouse Matt Damon, Paul Greengrass, Gregory Goodman, Frank Marshall, Jeffrey M. Weiner and Ben Smith

Answer: Matt Damon