Question: Which cousin of Joan of Lancaster's father was deposed with her father's help?

Context paragraphs:
Periyapillai: Periyapillai (Tamil: பெரியபிள்ளை ) (died 1582) was of one of the Aryacakravarti rulers of Jaffna kingdom who followed in the chaotic period after the death of Cankili I(1519–1561).  Some sources claim that he deposed the Cankili I's son, Puviraja Pandaram as soon as Cankili I died.  Others say that there was an intermediate ruler named Kasi Nainar between him and the death of Cankili I.  He with the help of Thanjavur Nayak help mounted an attack on the Portuguese fort in the Mannar Island to regain territory lost during Cankili's rule but he was defeated.  Due to a local uprising he lost power to Puviraja Pandaram.  He is considered to be the father (or grandfather) of the last king of the Kingdom, Cankili II and Migapulle Arachchi.

Parallel and cross cousins: In discussing consanguineal kinship in anthropology, a parallel cousin or ortho-cousin is a cousin from a parent's same-sex sibling, while a cross cousin is from a parent's opposite-sex sibling.  So a parallel cousin is the child of the father's brother (paternal uncle's child) or of the mother's sister (maternal aunt's child), while a cross cousin is the child of the mother's brother (maternal uncle's child) or of the father's sister (paternal aunt's child).  Where there are unilineal descent groups in a society (i.e. matrilineal and/or patrilineal), one's parallel cousins on one or both sides will belong to one's own descent group, while cross cousins will not (assuming descent group exogamy).

Ivan Stephen of Bulgaria: Ivan Stefan (Bulgarian: Иван Стефан ; in English also "John Stephen") (c. 1300/1301–1373 (?))  ruled as emperor (tsar) of Bulgaria for eight months from 1330 to 1331.  He was the eldest son of emperor Michael III Shishman and Anna Neda of Serbia, a daughter of King Stefan Uroš II Milutin of Serbia.  Ivan Stephen was descendent to the Terter dynasty, the Asen dynasty and the Shishman dynasty, which were all of partial Cuman origin.  After his father's accenssion to the throne in 1323 Ivan Stefan was associated as co-emperor.  When Michael III Shishman divorced Anna Neda to marry Theodora Palaiologina, the daughter of Byzantine emperor Michael IX Palaiologos, in 1324, Ivan Stefan was exiled along with his mother and brother in a monastery.  In the summer of 1330 he became emperor of Bulgaria with the help of his uncle Stephen Dečanski.  After he was deposed in a coup d'état by the Tarnovo nobility, he fled along with Anna Neda in the domains of his father's brother Belaur in Niš and later to Dubrovnik.  He was later expelled from there by Stephen Dušan under the pressure of Ivan Alexander.  Ivan Stefan probably died in Naples.

Sima Shi: Sima Shi (208 – March 255), courtesy name Ziyuan, was a military general and regent of Cao Wei during the Three Kingdoms period of China.  In 249, he assisted his father Sima Yi in overthrowing the emperor Cao Fang's regent Cao Shuang, allowing the Sima family to become paramount authority in the state, and he inherited his father's authority after his father's death in 251.  He maintained a tight grip on the political scene and, when the emperor Cao Fang considered action against him in 254, he had Cao Fang deposed and replaced with his cousin Cao Mao.  This tight grip eventually allowed him to, at the time of his death in 255, transition his power to his younger brother Sima Zhao, whose son Sima Yan eventually usurped the throne and established the Jin dynasty.

Eleanor de Bohun, Countess of Ormonde: Eleanor de Bohun, Countess of Ormond (17 October 1304 – 7 October 1363) was an English noblewoman born in Knaresborough Castle to Humphrey de Bohun, 4th Earl of Hereford, and Elizabeth, daughter of King Edward I of England and Eleanor of Castile.  After the deaths of her parents, she was placed in the care of her aunt Mary Plantagenet and brought up at Amesbury Priory alongside various cousins including Joan Gaveston, Isabel of Lancaster and Joan de Monthermer.  Edward II of England gave the priory a generous allowance of 100 marks annually for the upkeep of Eleanor and her younger cousin, Joan Gaveston.

Henry, 3rd Earl of Lancaster: Henry, 3rd Earl of Leicester and Lancaster (c. 1281 – 22 September 1345) was a grandson of King Henry III (1216–1272) of England and was one of the principals behind the deposition of King Edward II (1307–1327), his first cousin.

Battle of Burton Bridge (1322): The 1322 Battle of Burton Bridge was fought between Thomas, 2nd Earl of Lancaster and his cousin Edward II of England during the Despenser War.  Edward's army was proceeding northwards to engage Lancaster, having defeated his Marcher Lord allies in Wales.  Lancaster fortified the bridge at Burton upon Trent, an important crossing of the River Trent, in an attempt to prevent the King from proceeding.  Edward arrived at nearby Cauldwell on 7 March 1322 and intended to use the ford at Walton-on-Trent to cross the river and outflank Lancaster.  Edward was delayed for three days by floodwaters, during which time some of his force was deployed opposite Lancaster's men at the bridge.

Bobbi Lancaster: Bobbi Lancaster was born Robert Douglas Lancaster on June 23rd 1950 in Chatham , Ontario, Canada.  Her father, Douglas Lorne Lancaster was a high school graduate and World War 2 U.S. paratrooper and later worked for Revenue Canada.  He died in 1984.  Bobbi's mother, Rosalie Clara Lancaster was a farmers daughter .  At the age of fourteen, she finished formal education and worked in a garment factory making uniforms for the military.  She married Douglas in 1948.  Bobbi was the first of four children.  The family lived in Chatham until 1956 and then moved to Ridgetown, a small town in southwestern Ontario farm country.  Young Bobbi was an excellent student who excelled at all sports, delivered newspapers, studied butterflies, served mass as a Catholic altar boy and learned to play the piano.  She was introduced to golf by her father, an excellent player, who was on the Board of Ridgetown Golf and Curling Club.  The Lancaster's moved to Hamilton Ontario in 1960 where Bobbi continued piano studies with the Royal Conservatory of Music and caddied.  She became caddy champion at Hamilton Golf and C.C. at fourteen years of age and attended Cathedral Boys High School where she was taught by Jesuit priests.  Bobbi dreamed of being a professional golfer,a biologist, a pianist or perhaps a priest.

Joan of Lancaster: Joan of Lancaster ( 1312 – 7 July 1349) sometimes called Joan Plantagenet after her dynasty's name, was the third daughter of Henry, 3rd Earl of Lancaster and Maud Chaworth.

Nakhon Noi: Nakhon Noi briefly occupied the throne of Lan Xang from 1582–1583 on the death of his father Sen Soulintha, who himself had been appointed as a vassal to the Toungoo Empire from 1580-1582.  Nakhon Noi took the regnal name "Samdach Brhat Chao Samdach Brhat Chao Negara Nawi Raja Sri Sadhana Kanayudha".  Little is known about his brief rule, it does not appear in the sources that the Burmese were at the origin of his selection to succeed Sen Soulintha and were instead informed belatedly.  If he had supporters in the royal court of Lan Xang they were few and quickly became unhappy with his rule.  Within the year the royal court had petitioned King Nanda Bayin for his removal.  According to various versions of the chronicles it is cited that Nakhon Noi “did not rule with fairness,” or keep to the religious and behavioral precepts which were traditionally required by a sovereign.  Other versions record that he simply had made enemies at court, or was perceived as illegitimate because (like his father Sen Soulintha) he was of common origins.  Either at the hands of the royal court, or the Burmese, Nakhon Noi was deposed, arrested, and returned to Pegu.  After Nakhon Noi was deposed a period of interregnum occurred from 1583-1591 which historian Paul Le Boulanger describes as a period of “absolute confusion,” among the factions at court.  The chronicles again agree that it was only after the period of succession crisis that a petition was finally sent in 1591 to Nanda Bayin by the Lao sangha and Lan Xang court asking for Prince No Muang, the son and legitimate heir of Setthathirath, to be appointed as king.  Nanda Bayin confirmed the request and Prince No Muang would take the throne as Nokeo Koumane and reign Lan Xang from 1591-1596.

Supporting paragraphs: Joan of Lancaster Henry, 3rd Earl of Lancaster
Answer: King Edward II