paragraph_text: Antonio Oliviero (born 18 July 1943 in Sorrento, Naples) is a sailor from Italy. Oliviero represented his country at the 1972 Summer Olympics in Kiel. Oliviero di Amato took 19th place in the Soling with Giuseppe Milone as helmsman and Roberto Mottola di Amato as fellow crew member.

paragraph_text: Arnoud Eugène van der Biesen (December 28, 1899 Semarang, Dutch East Indies - February 17, 1968, The Hague) was a sailor from the Netherlands, who represented his native country at the 1920 Summer Olympics in Ostend, Belgium.

paragraph_text: The Queen Elisabeth Medical Foundation (QEMF) is a Belgian non-profit organization, founded in 1926 by Elisabeth of Bavaria, wife of Albert I. She founded the organization, based on her experience with the wounded from the front-line during the First World War. The foundation wants to encourage laboratory research and contacts between researchers and clinical practitioners, with a particular focus on neurosciences. The QEMF supports seventeen university teams throughout Belgium.

paragraph_text: Trehörningen (Swedish: "The Triangle") is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån Lake System, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta.

paragraph_text: Ralph Gomes (born June 13, 1937 in Uitvlugt) is a retired track and field athlete from Guyana. He competed in the middle-distances, and represented his native country at the 1960 Summer Olympics in Rome, Italy.

paragraph_text: Sweden competed at the 1920 Summer Olympics in Antwerp, Belgium. 260 competitors, 247 men and 13 women, took part in 100 events in 18 sports.

paragraph_text: Tug of war was contested as a team event in the Summer Olympics at every Olympiad from 1900 to 1920. Originally the competition was entered by groups called clubs. A country could enter more than one club in the competition, making it possible for one country to earn multiple medals. This happened in 1904, when the United States won all three medals, and in 1908 when the podium was occupied by three British teams. Sweden was also among the top countries with two medals, one as a member of the mixed team.

paragraph_text: The 1980 Summer Olympics boycott was one part of a number of actions initiated by the United States to protest the Soviet invasion of Afghanistan. The Soviet Union, which hosted the 1980 Summer Olympics, and other countries would later boycott the 1984 Summer Olympics in Los Angeles.

paragraph_text: Alberto Angelini (born 28 September 1974 in Savona) is a retired water polo player from Italy, who represented his native country at four consecutive Summer Olympics, starting in 1996 (Atlanta, Georgia). He was a member of the men's national team that claimed the bronze medal in 1996.

paragraph_text: Roberto Calcaterra (born February 2, 1972 in Civitavecchia) is a retired water polo defense player from Italy, who represented his native country at the 1996 Summer Olympics in Atlanta, Georgia. There he won the bronze medal with the men's national team. Calcaterra also competed at the 2004 Summer Olympics in Athens, Greece.

paragraph_text: Herman Carel Felix Clotilde von Heijden (11 April 1890 in Weerselo – 17 November 1982 in Boxtel) was a football (soccer) player from the Netherlands, who represented his home country at the 1920 Summer Olympics. There he won the bronze medal with the Netherlands national football team. He was also present at the 1912 Summer Olympics although he did not play and therefore received no medal. Later he became mayor of Rosmalen, North Brabant (1923–1955).

paragraph_text: Paola Paggi (born 6 December 1976 in Ivrea, Piedmont) is a volleyball player from Italy, who represented her native country in two consecutive Summer Olympics, starting in 2000. She was a member of the Women's National Team, that won the title at the 2002 FIVB Women's World Championship in Germany. Paggi made her debut for Italy on 22 May 1999 against Cuba.

paragraph_text: Paola Cavallino (born 6 June 1977 in Genova) is a butterfly swimmer from Italy, who won the silver medal in the women's 200 metres butterfly event at the 2004 European Championships. She represented her native country a couple of months later at the 2004 Summer Olympics in Athens, Greece.

paragraph_text: Ronald ("Ron") Owen Laird (born May 31, 1938 in Louisville, Kentucky) was a race walker from the United States, who competed for the New York Athletic Club. He represented his native country at four Olympiads. His best finish was 19th place in the men's 50 km walk at the 1960 Summer Olympics in Rome, Italy. He won the 20 km event at the 1967 Pan American Games, and finished 25th in that event in the Mexico City 1968 Summer Olympics and 20th in the Montreal 1976 Summer Olympics, but was disqualified in the 1964 Summer Olympics event in Tokyo.

paragraph_text: Francesco Postiglione (born 29 April 1972 in Naples) is a former swimmer and water polo player from Italy, who represented his native country at four Summer Olympics: 1992, 1996, 2000 and 2004. At his Olympic debut he competed as a breaststroke swimmer (1992). Four years later he claimed the bronze medal with the men's national team at the 1996 Summer Olympics in Atlanta, USA.

paragraph_text: On 3 May 1915 Italy officially revoked the Triple Alliance. In the following days Giolitti and the neutralist majority of the Parliament opposed declaring war, while nationalist crowds demonstrated in public areas for it. (The nationalist poet Gabriele D'Annunzio called this period le radiose giornate di Maggio -- ``the sunny days of May ''). Giolitti had the support of the majority of Italian parliament so on 13 May Salandra offered his resignation to King Victor Emmanuel III, but then Giolitti learned that the London Pact was already signed: fearful of a conflict between the Crown and the Parliament and the consequences on both internal stability and foreign relationships, Giolitti accepted the fait accompli, declined to succeed as prime minister and Salandra's resignation was not accepted. On 23 May, Italy declared war on Austria - Hungary. This was followed by declarations of war on the Ottoman Empire (21 August 1915, following an ultimatum of 3 August), Bulgaria (19 October 1915) and the German Empire (28 August 1916).

paragraph_text: He competed at the 1920 and the 1924 Summer Olympics. Vittorio Zucca has won four time the individual national championship. On the track in the sand of a 100 meters of the Olympic Games in Antwerp in 1920, he measured Vittorio Zucca, a native of Pula, at that time part of the Kingdom of Italy. Zucca was also in Paris 1924.

paragraph_text: Roldano Simeoni (Civitavecchia, December 21, 1948) is a retired water polo player from Italy, who competed in three consecutive Summer Olympics for his native country, starting in 1972.

paragraph_text: Ahn Byeong-keun (born February 23, 1962) is a retired judoka from South Korea, who represented his native country at the 1984 Summer Olympics. There he claimed the gold medal in the men's lightweight division (– 71 kg) by defeating Italy's Ezio Gamba in the final.

paragraph_text: Sport plays an important role in Estonian culture. After declaring independence from Russia in 1918, Estonia first competed as a nation at the 1920 Summer Olympics, although the National Olympic Committee was established in 1923. Estonian athletes took part of the Olympic Games until the country was annexed by the Soviet Union in 1940. The 1980 Summer Olympics Sailing regatta was held in the capital city Tallinn. After regaining independence in 1991, Estonia has participated in all Olympics. Estonia has won most of its medals in athletics, weightlifting, wrestling and cross-country skiing. Estonia has had very good success at the Olympic games given the country's small population. Estonia's best results were being ranked 13th in the medal table at the 1936 Summer Olympics, and 12th at the 2006 Winter Olympics.

Question: When did Italy enter the conflict that Albert I of the country the 1920 Summer Olympics took place in which the country Trehörningen is located in also participated?
Answer: 1915