Dafydd Baentiwr was a 16th-century Welsh poet.
 A bardic controversy ("ymryson") contains his only known surviving works (a poem written by Dafydd to Gruffydd, a poem written by Gruffydd in reply, and another poem written by Dafydd).
"And So It Goes" is a lyric poem written by Billy Joel in 1983, though it was not released until six years later.
 It appeared as the tenth and final track of his 1989 studio album "Storm Front".
 The original 1983 demo was released on the 2005 box set "My Lives".
 Joel wrote the song about a doomed relationship with model Elle Macpherson.
 Their relationship was dramatic, as Macpherson was only a teenager while Joel was reaching his mid-30s.
 Joel dated Macpherson for a brief time shortly before becoming involved with model Christie Brinkley, who would ultimately become his second wife.
 The song is unique for Joel as it is written in iambic tetrameter.
 In the original demo version of "And So It Goes," Joel sings the melody simply, accompanied by a simple piano backdrop, in a style very reminiscent of a hymn.
 On the 1989 album version, Joel sings and plays all the instrumentation (piano and synthesizers).
 The official video is from a live performance in front of a concert audience.
Reflections on Having Left a Place of Retirement is a poem written by English poet Samuel Taylor Coleridge in 1796.
 Like his earlier poem "The Eolian Harp", the poem discusses Coleridge's understanding of nature and his married life, which was suffering from problems that developed after the previous poem.
 Overall, the poem focuses on humanity's relationship with nature in its various aspects ranging from experiencing an Edenic state to having to abandon a unity with nature in order to fulfill a moral obligation to humanity.
 The discussion of man's obligation to each other leads into a discussion on the difference between the life of a philosopher and the life of a poet.
 By the end of the poem, the narrator follows the philosophical path in a manner similar to what Coleridge sought to do.
 The response to the poem from critics was mostly positive with many of them emphasizing the religious aspects of the poem in their analysis.
Olivier Chandon (September 17, 1955 – March 2, 1983), also called Olivier Chandon de Brailles, Oliver Chandon de Briailles, and Olivier Chandon Debrailles, was a French race car driver, heir to the Moët et Chandon champagne, and one-time boyfriend of the American model Christie Brinkley.
"That's Not Her Style" is a song by Billy Joel released as the fifth single from his album "Storm Front", as well as the opening track on the album.
 It was written for Joel's then-wife Christie Brinkley.
"Lullabye (Goodnight, My Angel)" is the seventh track and third single from Billy Joel's 1993 album "River of Dreams".
 It was inspired by Alexa Ray Joel, his daughter by Christie Brinkley.
 The song is in the key of G major.
National Lampoon's Vacation, sometimes referred to as Vacation, is a 1983 American road comedy film directed by Harold Ramis and starring Chevy Chase, Beverly D'Angelo, Randy Quaid, Dana Barron, and Anthony Michael Hall.
 John Candy, Imogene Coca, Christie Brinkley, and a young Jane Krakowski appear in supporting roles.
 The screenplay was written by John Hughes, based on his short story "Vacation '58" which appeared in "National Lampoon.
Paulina Porizkova (born Pavlína Pořízková ; ] ; 9 April 1965) is a Czech-born Swedish model, actress and author, who holds dual U.S. and Swedish citizenship.
 At 18 years old, in 1984, she became the first woman from Central Europe to be on the cover of the "Sports Illustrated" swimsuit issue.
 She was the second woman (after Christie Brinkley) to be featured on the swimsuit issue's front cover consecutive times (1984 and 1985).
 She joined judging in "America's Next Top Model" in Cycles 10–12.
Christie Brinkley (born Christine Lee Hudson, February 2, 1954) is an American model and actress.
 Brinkley gained worldwide fame beginning in the late 1970s with three consecutive "Sports Illustrated Swimsuit Issue" covers through 1981.
 She spent twenty five years as the face of CoverGirl (the longest running cosmetics contract of any model in history), has appeared on over 500 magazine covers, and has signed contracts with major brands—both fashion and non-fashion.
Alexa Ray Joel (born December 29, 1985) is an American singer, songwriter, and pianist.
 She is the older daughter of singer-songwriter Billy Joel and first child of model Christie Brinkley.
 She released an EP "Sketches" (2006) and several singles on independent record labels.
 She has performed at numerous charity events and New York City fashion events, and in 2010 was chosen to be the spokesmodel for Prell shampoo.

Question: "And So It Goes" is a poem written by which person that also married Christie Brinkley?
Answer: Billy Joel