Question: Beatrice Helen Beckett was the first wife of a politician who served three periods as what?

Context paragraphs:
Einar Gerhardsen:    (10 May 1897 – 19 September 1987) was a Norwegian politician from the Labour Party of Norway.  He was Prime Minister for three periods, 1945–1951, 1955–1963 and 1963–1965.  With 17 years in office, he is the longest serving Prime Minister in Norway since the introduction of parliamentarism.  Many Norwegians often refer to him as "Landsfaderen" (Father of the Nation); he is generally considered one of the main architects of the rebuilding of Norway after World War II.  He also served as the second President of the Nordic Council in 1954.

Nicholas Eden, 2nd Earl of Avon: Nicholas Eden, 2nd Earl of Avon, OBE (3 October 1930 – 17 August 1985), styled Viscount Eden between 1961 and 1977, was a British Army officer and, later, a Conservative politician.  He was the younger son of Prime Minister Sir Anthony Eden and his first wife, Beatrice ("née" Beckett).

Jens Landmark: Jens Landmark (17 December 1811 – 9 July 1880) was a Norwegian military officer and politician.  He reached the rank of lieutenant colonel, was the director of Kongsberg Weapons Factory from 1854 to 1880, invented the Landmark conversion and served both as mayor as well as three periods in the Norwegian Parliament.

Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.

Halftime show: A halftime show is a performance given during the brief period between the first and second halves, or the second and third quarters, of a sporting event.  Halftime shows are not given for sports with an irregular or indeterminate number of divisions (such as baseball or boxing), or for sports that do not have an extended period of stoppage in play.  Ice hockey games consist of three periods, so there are in effect two halftimes at a hockey game: the first intermission is between the first and second periods, and the second intermission comes between the second and third periods.  The intermissions are usually given over to contests involving randomly selected audience members.

Beatrice Beckett: Beatrice Helen Beckett (27 July 1905 – 29 June 1957) was the first wife of the British statesman Anthony Eden.

Robert Richards (British politician): Robert Richards (7 May 1884 – 22 December 1954) was a British Labour Party politician, who served as Member of Parliament (MP) for Wrexham in North Wales for three periods between 1929 and 1954.

Ioseb Chugoshvili: Ioseb Ivanesh Chugoshvili (Georgian: იოსებ ივანეს ჩუგოშვილი ; born July 29, 1986 in Telavi, Georgia) is an amateur Belarusian Greco-Roman wrestler of Georgian origin, who competes in the men's super heavyweight category.  Chugoshvili represented Belarus at the 2012 Summer Olympics in London, where he competed in the 120 kg class, an event which was dominated by defending Olympic champion Mijaín López of Cuba.  He was eliminated in his first preliminary match against Estonia's Heiki Nabi, with a technical score of 1–4 after two periods, and a classification score of 1–3.  Because Nabi advanced further into the final match against López, Chugoshvili offered another shot for an Olympic bronze medal through the repechage bouts.  He first defeated Poland's Łukasz Banak, but lost the bronze medal match to Sweden's Johan Euren, who stopped him with a par terre position in order to score a point each in two out of three periods.

Gwladys, Lady Delamere: Gwladys, Lady Delamere (1897–1943), formerly Lady Charles Markham, née Gwladys Helen Beckett was the first female Mayor of Nairobi from 1938 to 1940.  She was awarded a CBE in 1941 for public services in Kenya.  In March 1941 she gave evidence at the trial in Kenya of Sir Henry John Delves Broughton for the murder of Josslyn Hay, 22nd Earl of Erroll.  She died on 22 February 1943 and was buried at Soysambu.

Helen of Galloway: Helen of Galloway (fl.  thirteenth century) was a daughter and co-heiress of Alan, Lord of Galloway (died 1234) and his first wife, a daughter of Roger de Lacy, Constable of Chester.  Helen was the first wife of Roger de Quincy, Earl of Winchester (died 1264).  Although Helen was the first of Roger's three wives, his only descendants were his three daughters by Helen.  The eldest daughter, Margaret, married William de Ferrers, Earl of Derby (died 1254); the second daughter, Elizabeth (or Isabella), married Alexander Comyn, Earl of Buchan (died 1289); the third daughter, Helen, married Alan de la Zouche (died 1270).

Supporting paragraphs: Beatrice Beckett Anthony Eden
Answer: Foreign Secretary