Question: What year was a free-travel area created between ireland and the birth country of the singer behind Hill of Thieves?

full_context: Document 1: Never in a Million Years (Cara Dillon song): "Never In A Million Years" is the lead single release from After The Morning, the third album by Cara Dillon. The single was released as a promo for radio stations in the UK and Ireland. The single was also released exclusively by iTunes as a digital download a week prior to the release of "After the Morning", where it climbed to #39 in the iTunes Top 100.
Document 2: Cara Dillon: Cara Elizabeth Dillon (born 21 July 1975, Dungiven, County Londonderry, Northern Ireland) is an Irish folk singer. In 1995, she joined the folk supergroup Equation and signed a record deal with Warners Music Group. After leaving the group, she collaborated with Sam Lakeman under the name Polar Star. In 2001, she released her first solo album, "Cara Dillon", which featured traditional songs and two original Dillon\Lakeman compositions. The album was an unexpected hit in the folk world, with Dillon receiving four nominations at the 2002 BBC Radio 2 Folk Awards.
Document 3: Dolores O'Riordan: Dolores O'Riordan O'Riordan performing at Montreal in May 2012 Dolores Mary Eileen O'Riordan (1971 - 09 - 06) 6 September 1971 Ballybricken, County Limerick, Ireland 15 January 2018 (2018 - 01 - 15) (aged 46) Mayfair, London, England Resting place Caherelly Cemetery Occupation Singer songwriter musician Spouse (s) Don Burton (m. 1994; div. 2014) Children Musical career Genres Alternative rock post-grunge celtic rock Instruments Vocals guitar keyboards bass Years active 1989 -- 2018 Labels Sanctuary Cooking Vinyl Associated acts The Cranberries D.A.R.K. Signature
Document 4: Billy Connolly: In 1985, he divorced Iris Pressagh, his wife of sixteen years (they had separated four years earlier) and he was awarded custody of their children Jamie and Cara. That same year, he performed An Audience with..., which was videotaped at the South Bank Television Centre in front of a celebrity audience for ITV. The uncut, uncensored version was subsequently released on video. In July 1985, he performed at the Wembley leg of Live Aid, immediately preceding Elton John.
Document 5: British Isles: The British Isles are a group of islands off the north-western coast of continental Europe that consist of the islands of Great Britain, Ireland and over six thousand smaller isles. Situated in the North Atlantic, the islands have a total area of approximately 315,159 km2, and a combined population of just under 70 million. Two sovereign states are located on the islands: Ireland (which covers roughly five-sixths of the island with the same name) and the United Kingdom of Great Britain and Northern Ireland. The British Isles also include three Crown Dependencies: the Isle of Man and, by tradition, the Bailiwick of Jersey and the Bailiwick of Guernsey in the Channel Islands, although the latter are not physically a part of the archipelago.
Document 6: After the Morning (Cara Dillon album): "After the Morning" is the third solo album from folk artist Cara Dillon. It was recorded at their home studio in Frome, Somerset, Mayfair, Kore, Amberville and Sun Street Studios. The strings and brass were recorded in Prague. Similar to her previous albums, "After the Morning" was produced by Sam Lakeman, her husband and musical partner. Additional production was by Mike 'Spike' Drake, who also mixed the album. The album features the singles "Never in a Million Years", and the double A-side of "I Wish You Well" and "This Time".
Document 7: British Isles: There are two sovereign states in the isles: Ireland and the United Kingdom of Great Britain and Northern Ireland. Ireland, sometimes called the Republic of Ireland, governs five sixths of the island of Ireland, with the remainder of the island forming Northern Ireland. Northern Ireland is a part of the United Kingdom of Great Britain and Northern Ireland, usually shortened to simply the United Kingdom, which governs the remainder of the archipelago with the exception of the Isle of Man and the Channel Islands. The Isle of Man and the two states of the Channel Islands, Jersey and Guernsey, are known as the Crown Dependencies. They exercise constitutional rights of self-government and judicial independence; responsibility for international representation rests largely upon the UK (in consultation with the respective governments); and responsibility for defence is reserved by the UK. The United Kingdom is made up of four constituent parts: England, Scotland and Wales, forming Great Britain, and Northern Ireland in the north-east of the island of Ireland. Of these, Scotland, Wales and Northern Ireland have "devolved" governments meaning that they have their own parliaments/assemblies and are self-governing with respect to certain areas set down by law. For judicial purposes, Scotland, Northern Ireland and England and Wales (the latter being one entity) form separate legal jurisdiction, with there being no single law for the UK as a whole.
Document 8: Carly Simon: After a brief stint with her sister Lucy Simon as duo group the Simon Sisters, she found great success as a solo artist with her 1971 self-titled debut album "Carly Simon", which won her the Grammy Award for Best New Artist, and spawned her first Top 10 single "That's the Way I've Always Heard It Should Be". She achieved international fame with her third album "No Secrets" which sat firmly at No. 1 on the "Billboard" 200 for five weeks and spawned the worldwide hit "You're So Vain", for which she received three Grammy nominations, including Record of the Year and Song of the Year. With her 1988 hit "Let the River Run", from the film "Working Girl", she became the first artist to win a Grammy Award, an Academy Award, and a Golden Globe Award for a song composed and written, as well as performed, entirely by a single artist.
Document 9: British Isles: Ireland, the United Kingdom and the three Crown Dependencies are all parliamentary democracies, with their own separate parliaments. All parts of the United Kingdom return members to parliament in London. In addition to this, voters in Scotland, Wales and Northern Ireland return members to a parliament in Edinburgh and to assemblies in Cardiff and Belfast respectively. Governance in the norm is by majority rule, however, Northern Ireland uses a system of power sharing whereby unionists and nationalists share executive posts proportionately and where the assent of both groups are required for the Northern Ireland Assembly to make certain decisions. (In the context of Northern Ireland, unionists are those who want Northern Ireland to remain a part of the United Kingdom and nationalists are those who want Northern Ireland join with the rest of Ireland.) The British monarch is the head of state for all parts of the isles except for the Republic of Ireland, where the head of state is the President of Ireland.
Document 10: Hill of Thieves: Hill of Thieves is the fourth solo album by Irish folk singer Cara Dillon. It is her first full-length release on Charcoal Records, the label formed in 2008 with her musical partner and husband Sam Lakeman. The album was recorded and produced by Sam and first became available in October 2008 at their live concerts. It is also the first release since she gave birth to their twin boys Noah and Colm at 26 weeks, after going into labour onstage at the Swindon Arts Centre, UK. It has been the most successful of her first four albums in relation to chart performance, entering at No. 7 in the UK Indie Album Charts (see below for more.)
Document 11: Poor Man's Heaven: Seth Lakeman's fourth album, Poor Man's Heaven (not to be confused with the EP of the same name released in late 2007), was released on 30 June 2008, entering the UK Album Charts at number 8. Taking over 10 months to finalise, many of the tracks on the album have been part of Lakeman's live set since the second half of 2006, the initial tracks performed being 'Poor Man's Heaven' and 'Race to be King', but this expanded towards the end of the tour, with new tracks continuing to be previewed throughout 2007 and into 2008.
Document 12: A Girl Called Dusty: Dusty Springfield had been a member of the girl group The Lana Sisters from 1958 to 1960, and the folk-pop trio The Springfields from 1960–1963, in the latter case with her brother Tom Springfield. While on tour in the US in the early 1960s she was exposed to soul music, which was to have a profound impact on her subsequent life and career. Although The Springfields were moderately successful, with songs such as "Island of Dreams", "Bambino" and "Silver Threads And Golden Needles" (a No. 16 US country hit), their style of music limited the wide range of material that Dusty Springfield wanted to sing. Therefore, in 1963, Springfield decided to begin a career as a solo singer.
Document 13: Mandolin: Noteworthy Irish mandolinists include Andy Irvine (who, like Johnny Moynihan, almost always tunes the top E down to D, to achieve an open tuning of GDAD), Paul Brady, Mick Moloney, Paul Kelly and Claudine Langille. John Sheahan and the late Barney McKenna, respectively fiddle player and tenor banjo player with The Dubliners, are also accomplished Irish mandolin players. The instruments used are either flat-backed, oval hole examples as described above (made by UK luthier Roger Bucknall of Fylde Guitars), or carved-top, oval hole instruments with arched back (made by Stefan Sobell in Northumberland). The Irish guitarist Rory Gallagher often played the mandolin on stage, and he most famously used it in the song "Going To My Hometown."
Document 14: British Isles: Ireland and the United Kingdom are both part of the European Union (EU). The Crown Dependencies are not a part of the EU however do participate in certain aspects that were negotiated as a part of the UK's accession to the EU. Neither the United Kingdom or Ireland are part of the Schengen area, that allow passport-free travel between EU members states. However, since the partition of Ireland, an informal free-travel area had existed across the region. In 1997, this area required formal recognition during the course of negotiations for the Amsterdam Treaty of the European Union and is now known as the Common Travel Area.
Document 15: British Isles: The Northern Ireland Peace Process has led to a number of unusual arrangements between the Republic of Ireland, Northern Ireland and the United Kingdom. For example, citizens of Northern Ireland are entitled to the choice of Irish or British citizenship or both and the Governments of Ireland and the United Kingdom consult on matters not devolved to the Northern Ireland Executive. The Northern Ireland Executive and the Government of Ireland also meet as the North/South Ministerial Council to develop policies common across the island of Ireland. These arrangements were made following the 1998 Good Friday Agreement.
ground_truth: 1997
sub_queries: Hill of Thieves >> performer Answer: Cara Dillon
Cara Dillon >> country of citizenship Answer: Northern Ireland
When was a free-travel area created betwen Northern Ireland and Ireland? Answer: 1997