Problem: Background: Isabella I (Spanish: Isabel, 22 April 1451 - 26 November 1504) reigned as Queen of Castile from 1474 until her death. Her marriage to Ferdinand II of Aragon became the basis for the political unification of Spain under their grandson, Charles I. After a struggle to claim her right to the throne, she reorganized the governmental system, brought the crime rate to the lowest it had been in years, and unburdened the kingdom of the enormous debt her brother had left behind.
Context: At the end of the Reconquista, only Granada was left for Isabella and Ferdinand to conquer. The Emirate of Granada had been held by the Muslim Nasrid dynasty since the mid-13th century. Protected by natural barriers and fortified towns, it had withstood the long process of the reconquista. On 1 February 1482, the king and queen reached Medina del Campo and this is generally considered the beginning of the war for Granada. While Isabella's and Ferdinand's involvement in the war was apparent from the start, Granada's leadership was divided and never able to present a united front. It still took ten years to conquer Granada, however, culminating in 1492.  The Spanish monarchs recruited soldiers from many European countries and improved their artillery with the latest and best cannons. Systematically, they proceeded to take the kingdom piece by piece. In 1485 they laid siege to Ronda, which surrendered after only a fortnight due to extensive bombardment. The following year, Loja was taken, and again Muhammad XII was captured and released. One year later, with the fall of Malaga, the western part of the Muslim Nasrid kingdom had fallen into Spanish hands. The eastern province succumbed after the fall of Baza in 1489. The siege of Granada began in the spring of 1491 and at the end of the year, Muhammad XII surrendered. On 2 January 1492 Isabella and Ferdinand entered Granada to receive the keys of the city, and the principal mosque was reconsecrated as a church. The Treaty of Granada was signed later that year, and in it Ferdinand and Isabella gave their word to allow the Muslims and Jews of Granada to live in peace. An uprising by the Moors in 1500 caused the Catholic side to consider that the Moors had violated the Treaty: this gave them a justification for revoking its provisions. See Morisco Revolt.  During the war, Isabella noted the abilities and energy of Gonzalo Fernandez de Cordoba and made him one of the two commissioners for the negotiations. Under her patronage, De Cordoba went on to an extraordinary military career that revolutionised the organisation and tactics of the emerging Spanish military, changing the nature of warfare and altering the European balance of power.
Question: what organisation?
Answer: that revolutionised the organisation and tactics of the emerging Spanish military,

Problem: Background: Once is a 2007 Irish romantic musical drama film written and directed by John Carney. The film stars Glen Hansard and Marketa Irglova as two struggling musicians in Dublin, Ireland. Hansard and Irglova had previously performed music as the Swell Season, and composed and performed the film's original songs. Once spent years in development with the Irish Film Board and was made for a budget of EUR112,000.
Context: Once was met with extremely positive reviews from critics. Upon its March 2007 release in Ireland, RTE's Caroline Hennessy gave the film 4 out of 5 stars and termed it "an unexpected treasure". About the acting, this Irish reviewer commented, "Once has wonderfully natural performances from the two leads. Although musicians first and actors second, they acquit themselves well in both areas. Irglova, a largely unknown quantity alongside the well-known and either loved or loathed Hansard, is luminous." Michael Dwyer of The Irish Times gave the film the same rating, calling it "irresistibly appealing" and noting that "Carney makes the point - without ever labouring it - that his protagonists are living in a changing city where the economic boom has passed them by. His keen eye for authentic locations is ... evident".  In May, on Ebert & Roeper, both Richard Roeper and guest critic Michael Phillips of the Chicago Tribune gave enthusiastic reviews. Phillips called it, "the most charming thing I've seen all year", "the Brief Encounter for the 21st century", his favorite music film since 1984's Stop Making Sense and said, "It may well be the best music film of our generation". Roeper referred to the film's recording studio scene as "more inspirational and uplifting than almost any number of Dreamgirls or Chicago or any of those multi-zillion dollar musical showstopping films. In its own way, it will blow you away." Once won very high marks from U.S. critics; it is rated 97% "fresh" by the film review aggregation site Rotten Tomatoes and scored a grade of 88 ("universal acclaim") according to Metacritic.  In late 2007, Amy Simmons of Time Out London wrote, "Carney's highly charged, urban mise-en-scene with its blinking street lamps, vacant shops and dishevelled bed-sits provides ample poetic backdrop for the film's lengthy tracking shots, epitomised in a sequence where the Girl walks to the corner shop in pyjamas and slippers while listening to one of the Guy's songs on her personal stereo. With outstanding performances from Hansard and new-comer Irglova, Carney has created a sublime, visual album of unassuming and self-assured eloquence." The Telegraph's Sukhdev Sandhu said, "Not since Before Sunset has a romantic film managed to be as touching, funny or as hard to forget as Once. Like Before Sunset, it never outstays its welcome, climaxing on a note of rare charm and unexpectedness."  The film appeared on many North American critics' top ten lists of the best films of 2007:  In 2008, the film placed third on Entertainment Weekly's "25 Best Romantic Movies of the Past 25 Years".
Question: What was the critical response to once?
Answer:
extremely positive reviews from critics.