Question: when was the  Irish dancer and actress which Leila Mackinlay novel was  based on born 
Context: Marie Dolores Eliza Rosanna Gilbert, Countess of Landsfeld (17 February 1821 – 17 January 1861), better known by the stage name Lola Montez, was an Irish dancer and actress who became famous as a "Spanish dancer", courtesan, and mistress of King Ludwig I of Bavaria, who made her Countess of Landsfeld.  She used her influence to institute liberal reforms.  At the start of the Revolutions of 1848 in the German states, she was forced to flee.  She proceeded to the United States via Switzerland, France and London, returning to her work as an entertainer and lecturer. Lola Montès (1955) is an epic historical romance film and the last completed film of German-born director Max Ophüls.  It is based on the life of the celebrated Irish dancer and courtesan Lola Montez (1821–1861), portrayed by Martine Carol, and tells the story of the most famous of her many notorious affairs, those with Franz Liszt and Ludwig I of Bavaria.  A French production, the dialogue is mostly in French and German, with a few English language sequences.  The most expensive European film produced up to its time, "Lola Montès" flopped at the box office.  It had an important artistic influence, however, on the French New Wave cinema movement and continues to have many distinguished critical admirers.  Heavily re-edited (multiple times) and shortened after its initial release for commercial reasons, it has been twice restored (1968, 2008).  It was released on DVD and Blu-ray in North America by The Criterion Collection in February 2010. Leila Aboulela (born 1964), Arabic 'ليلى ابوالعلا' is a Sudanese writer who writes in English.  Her latest novel, "The Kindness of Enemies" is inspired by the life of Imam Shamil, who united the tribes of the Caucasus to fight against Russian Imperial expansion.  Leila's novel "Lyrics Alley", was Fiction Winner of the Scottish Book Awards and short-listed for a Regional Commonwealth Writers Prize.  She is also the author of the novels "The Translator" (a New York Times 100 Notable Book of the Year) and "Minaret".  All three novels were long-listed for the Orange Prize and the IMPAC Dublin Award.  Leila Aboulela won the Caine Prize for African Writing for her short story, "The Museum", included in the collection "Coloured Lights" which went on to be short-listed for the Macmillan/Silver PEN award.  Aboulela’s work has been translated into fourteen languages and included in publications such as "Granta", "The Washington Post" and "The Guardian".  BBC Radio has adapted her work extensively and broadcast a number of her plays including "The Mystic Life" and the historical drama "The Lion of Chechnya".  The five-part radio serialization of her novel "The Translator" was short-listed for the RIMA (Race In the Media Award).  Aboulela grew up in Khartoum and now lives in Aberdeen. Joan Denise Moriarty (died 24 January 1992) was an Irish ballet dancer, choreographer, teacher of ballet and traditional Irish dancer and musician.  She was the founder of professional ballet in Ireland. Kevin McCormack (born 1970) is a former professional Irish dancer who spent many years as a Dance Captain with "Riverdance".  The Dublin native was part of the original 24 troupe members for "Riverdance's" seven-minute interval act at the 1994 Eurovision Song Contest.  A 10-time World Irish Dance Champion, McCormack holds ADCRG titleship which means he is recognised by An Coimisiún Le Rincí Gaelacha, the governing body of Irish dancing worldwide, as being qualified to adjudicate Irish Step dancing on any competitive level throughout the world. Michaela Hinds (b. 1995) is an Irish-Canadian Irish dancer, the most awarded North American in the history of the An Coimisiún Le Rincí Gaelacha's World Irish Dancing Championships.  She retired from competition in 2017, after her seventh win. Leila Antoinette Sterling Mackinlay (5 September 1910 – 13 April 1996) was a British writer of romance novels from 1930 to 1979 as Leila S. Mackinlay or Leila Mackinlay and also under the pseudonym Brenda Grey.  Some of her novels are based on real people like Madame Vestris, Lola Montez or Jane Elizabeth Digby; she also wrote "Musical Productions", a musical book.  She was the daughter of the musician and writer Malcolm Sterling Mackinlay and granddaughter of the vocalist Antoinette Sterling. Leila Steinberg (born December 18, 1961) is an American manager, business woman, educator, writer, poet, and founder of AIM4TheHeART, a 501(c)(3) non-profit dedicated to helping at-risk youth find their voice using an emotional literacy curriculum and writing workshops.  She is best known as the artist mentor and first manager for superstar rapper Tupac Shakur, who came to her writing workshop, The Microphone Sessions, in the Oakland Bay area.  Today Leila manages the rapper Earl Sweatshirt, formerly of Odd Future.  In the 2017 Tupac biopic "All Eyez On Me", Leila was played by actress Lauren Cohan. Michael English (born in Castledermot, County Kildare, Ireland on 23 April 1979) is an Irish country singer.  He was born in a musical family as his father played button accordion with a traditional Irish band, his mother was an Irish dancer, and his two sisters played fiddle and piano. Irlandzki tancerz (English: "The Irish Dancer") is the fifth album by Polish group 2 Plus 1, released in 1979 by Wifon.  It was a concept album, inspired by traditional Irish folk music, and featured Polish translations of thirteen old Irish folk ballads.  The album was highly successful and gathered very favourable reviews.  In 2001, the album was reissued on CD with slightly different artwork.
Answer: 17 February 1821