"Slouching Toward Bethlehem" is episode 4 of season 4 in the television show "Angel".
 Its title derives from a line from the W. B. Yeats poem "The Second Coming".
Slouching Towards Gomorrah: Modern Liberalism and American Decline is a 1996 non-fiction book by former United States Court of Appeals judge Robert H. Bork.
 Bork's thesis in the book is that American and more generally Western culture is in a state of decline and that the cause of this decline is modern liberalism and the rise of the New Left.
 Specifically, he attacks modern liberalism for what he describes as its dual emphases on radical egalitarianism and radical individualism.
 The title of the book is a play on the last couplet of W. B. Yeats's poem "The Second Coming": "And what rough beast, its hour come round at last, / Slouches towards Bethlehem to be born?"
 Bork contends that the "rough beast of decadence … now sends us slouching towards our new home, not Bethlehem but Gomorrah."
Jnanappana is a devotional poem written by the 16th century Malayalam poet Poonthanam.
 This poem written as a devotional prayer to Guruvayoorappan is considered as an important work in Malayalam literature.
 Written in simple Malayalam, the Jnanappana was Poonthanam's magnum opus and is an important work of Bhakti literature from Kerala and is revered for its poetic merit and intensity of devotion.
Slouching Towards Bedlam is an interactive fiction game that won the first place in the 2003 Interactive Fiction Competition.
 It is a collaboration between Daniel Ravipinto and Star Foster.
 "Slouching Towards Bedlam" was finalist for eight 2003 XYZZY Awards, winning four: Best Game, Setting, Story, and Individual NPC (for the protagonist's cybernetic assistant, Triage).
 The game takes place in a steampunk Victorian era setting.
 Its title is inspired by a line from "The Second Coming", a poem by W.B. Yeats.
Mazeppa is a narrative poem written by the English romantic poet Lord Byron in 1819.
 It is based on a popular legend about the early life of Ivan Mazepa (1639–1709), a Ukrainian gentleman who later became Hetman of the Ukrainian Cossacks.
 According to the poem, the young Mazeppa has a love affair with a Countess Theresa while serving as a page at the Court of King John II Casimir Vasa.
 Countess Theresa was married to a much older Count.
 On discovering the affair, the Count punishes Mazeppa by tying him naked to a wild horse and setting the horse loose.
 The bulk of the poem describes the traumatic journey of the hero strapped to the horse.
 The poem has been praised for its "vigor of style and its sharp realization of the feelings of suffering and endurance".
 This poem also inspired Alexander Pushkin to write his poem "Poltava" as an answer to Byron's poem.
Slouching Towards Bethlehem is a 1968 collection of essays by Joan Didion that mainly describes her experiences in California during the 1960s.
 It takes its title from the poem "The Second Coming", by W. B. Yeats.
 The contents of this book are reprinted in Didion's "We Tell Ourselves Stories in Order to Live: Collected Nonfiction" (2006).
William Butler Yeats ( ; 13 June 186528 January 1939) was an Irish poet and one of the foremost figures of 20th century literature.
 A pillar of both the Irish and British literary establishments, he helped to found the Abbey Theatre, and in his later years served as an Irish Senator for two terms.
 Yeats was a driving force behind the Irish Literary Revival along with Lady Gregory, Edward Martyn and others.
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).
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.
The Shahnameh, also transliterated as Shahnama (Persian: شاهنامه‎ ‎ ] , "The Book of Kings"), is a long epic poem written by the Persian poet Ferdowsi between c. 977 and 1010 CE and is the national epic of Greater Iran.
 Consisting of some 50,000 "distichs" or couplets (two-line verses), the "Shahnameh" is the world's longest epic poem written by a single poet.
 It tells mainly the mythical and to some extent the historical past of the Persian Empire from the creation of the world until the Islamic conquest of Persia in the 7th century.
 Modern Iran, Azerbaijan, Afghanistan and the greater region influenced by the Persian culture (such as Georgia, Armenia, Turkey and Dagestan) celebrate this national epic.

Question: Slouching Toward Bethlehem took its title from the poem written by the poet of what nationality?
Answer: Irish