Conversation so far:
Is Maria married?
She married Schwarzenegger on April 26, 1986.
does she have children?
They have four children.
who are her children?
Katherine Eunice (born 1989), Christina Maria Aurelia (born 1991), Patrick Arnold (born 1993), and Christopher Sargent Shriver (born 1997).
what does her husband do for a living?
Austrian bodybuilder and actor.
how long have they been married?
April 26, 1986.
did they ever divorce?
Shriver filed for divorce on July 1, 2011.
citing "irreconcilable differences".
what caused the filing of the divorce?
irreconcilable differences".
what is a noteworthy fact about her personal llfe?
In 2013, Shriver began dating political consultant Matthew Dowd, the strategist for Arnold Schwarzenegger's 2006 reelection campaign.

Question: when did she begin dating  him?
Self-contained rewrite: when did Maria Shriver begin dating  political consultant Matthew Dowd?