Irish (Gaeilge), also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of the population. Irish enjoys constitutional status as the national and first official language of the Republic of Ireland. It is an official language of the European Union and an officially recognised minority language in Northern Ireland.

Irish was the predominant language of the Irish people for most of their recorded history, and they brought their Gaelic speech with them to other countries, notably Scotland and the Isle of Man, where it gave rise to Scottish Gaelic and Manx. It has the oldest vernacular literature in Western Europe. It began to decline under English and British rule after the seventeenth century. The nineteenth century saw a dramatic decrease in the number of speakers especially after the Great Famine of 1845–1852 (where Ireland lost 20–25% of its population either to emigration or death). Irish-speaking areas were especially hard hit. By the end of British rule, the language was spoken by less than 15% of the national population. Since then, Irish speakers have been in the minority except in areas collectively known as the Gaeltacht. Ongoing efforts have been made to preserve, promote and revive the language, particularly the Gaelic Revival.

Song In (in hangul 송인, in hanja 宋仁) was a civil official in the mid-Goryeo era who became the intermediary founder of the Jincheon Song clan. His highest post was munha pyeongjangsa (문하 평장사). This was the highest government position in the period. Song In was responsible for administration, judicial affairs and economy in the district.

As he performed meritorious deeds during the King, he was conferred with Chanhwagongsin and Jincheonbaek. Baek was a position of politicians who were responsible for administration, judicial affairs and economy in the district. As the government created him Jincheonbaek, his family started regarding Jincheon as their origin. Hence, the family origin became Jincheon Song.

When he was in the position of Sangsanbaek, he tried to be just and fair in all the administrative affairs and strived to enhance the welfare of his people. He also focused on education for the youth and courtesy for people, which made his district famous for most excellent behaviors in the nation. After that, the people have long paid tribute to his feats.