Problem: Gaelic Ireland (Irish: Eire Ghaidhealach) was the Gaelic political and social order, and associated culture, that existed in Ireland from the prehistoric era until the early 17th century. Before the Norman invasion of 1169, Gaelic Ireland comprised the whole island. Thereafter, it comprised that part of the country not under foreign dominion at a given time. For most of its history, Gaelic Ireland was a "patchwork" hierarchy of territories ruled by a hierarchy of kings or chiefs, who were elected through tanistry.

Ireland became Christianized between the 5th and 7th centuries. Pope Adrian IV, the only English pope, had already issued a Papal Bull in 1155 giving Henry II of England authority to invade Ireland as a means of curbing Irish refusal to recognize Roman law. Importantly, for later English monarchs, the Bull, Laudabiliter, maintained papal suzerainty over the island: In 1166, after losing the protection of High King Muirchertach Mac Lochlainn, King Diarmait Mac Murchada of Leinster was forcibly exiled by a confederation of Irish forces under King Ruaidri mac Tairrdelbach Ua Conchobair. Fleeing first to Bristol and then to Normandy, Diarmait obtained permission from Henry II of England to use his subjects to regain his kingdom. By the following year, he had obtained these services and in 1169 the main body of Norman, Welsh and Flemish forces landed in Ireland and quickly retook Leinster and the cities of Waterford and Dublin on behalf of Diarmait. The leader of the Norman force, Richard de Clare, 2nd Earl of Pembroke, more commonly known as Strongbow, married Diarmait's daughter, Aoife, and was named tanaiste to the Kingdom of Leinster. This caused consternation to Henry II, who feared the establishment of a rival Norman state in Ireland. Accordingly, he resolved to visit Leinster to establish his authority. Henry landed in 1171, proclaiming Waterford and Dublin as Royal Cities. Adrian's successor, Pope Alexander III, ratified the grant of Ireland to Henry in 1172. The 1175 Treaty of Windsor between Henry and Ruaidhri maintained Ruaidhri as High King of Ireland but codified Henry's control of Leinster, Meath and Waterford. However, with Diarmuid and Strongbow dead, Henry back in England, and Ruaidhri unable to curb his vassals, the high kingship rapidly lost control of the country. Henry, in 1185, awarded his younger son, John, the title Dominus Hiberniae, "Lord of Ireland". This kept the newly created title and the Kingdom of England personally and legally separate. However, when John unexpectedly succeeded his brother as King of England in 1199, the Lordship of Ireland fell back into personal union with the Kingdom of England.

Were invasions common?

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Problem: Yi Jianlian (simplified Chinese: Yi Jian Lian ; traditional Chinese: Yi Jian Lian ; pinyin: Yi Jianlian, pronounced [i tcjenljen], EE JEN lee-EN; born October 27, 1987) is a Chinese professional basketball player for the Guangdong Southern Tigers of the Chinese Basketball Association (CBA). He has also played in the National Basketball Association (NBA) for the Milwaukee Bucks, New Jersey Nets, Washington Wizards and Dallas Mavericks. Yi joined the Guangdong Southern Tigers for the 2002-03 CBA season, and subsequently won the CBA Rookie of the Year award. In his first five years with Guangdong, the team won three CBA titles.

As a child, Yi's parents did not allow him to join a sports school, which is designed for children predicted to be future professional athletes. However, a sports school's basketball coach who noticed Yi's potential in playing street basketball persuaded Yi's family to allow him to train professionally. Hoping to sign Yi to an endorsement deal, Adidas invited him to attend the company's ABCD camp in New Jersey in 2002, where he competed against all-American high school players. After returning to China later that year, he signed a professional contract with Chinese Basketball Association side Guangdong Southern Tigers and averaged 3.5 points and 1.9 rebounds per game in his first season. He also averaged 7.3 points and 7.3 rebounds per game in four games during the playoffs, and won the Rookie of the Year award. Yi was featured in TIME's August 2003 article titled "The Next Yao Ming". In each of his next three seasons, Yi led Guangdong to the CBA championship and he was awarded the CBA finals' most valuable player honor in 2006. In Yi's final season in the Chinese Basketball Association before he entered the 2007 NBA draft, he averaged a career-high 24.9 points and 11.5 rebounds per game, but his team lost to the Bayi Rockets in the playoff finals. During the 2011 NBA lockout, Yi signed a one-year contract to return to the Guangdong Southern Tigers. Unlike most NBA players who went to the Chinese Basketball Association during that time, he received an option to return to the NBA once the lockout had been resolved. After the lockout ended, he signed with the Dallas Mavericks for the remainder of the 2011-12 season. Yi re-joined the Guangdong Southern Tigers for the 2012-13 CBA season and went on to win a fourth championship that season. In October 2016, Yi returned to Guangdong after spending training camp with the Los Angeles Lakers.

when did this career start?

Answer with quotes:
Adidas invited him to attend the company's ABCD camp in New Jersey in 2002,