Concerning the personal records of Rhodri Map Merfyn Canmore and the Ailpin language.
When people imagine what a Wildling would look like they would often think of a fur-wearing and blood drunk savage that will not hesitate to gouge out the intestines of civilized men, and yet that is not the case, the peoples of Beyond the Wall had different cultures, laws, and customs that we the people of the South had mistakenly overlooked. And so it was rather a surprise to see the personal records of King Rhodri which was as much as possible preserved by his children and kept on a glass container, upon reading the record one can only imagine in detail the musings of a rising Wildling King and the kingdom he had built, it even has influenced his children as well as they had kept to themselves their own records writing in their Ailpin language.
The personal record was made of cow-skin, the writings on its surface was made through an ink mixture of resin, coal, and cow fat. The record itself was written in a branch of Old Tongue dialect which developed during the chieftaincy of Merfyn Map Merfyn, the Ailpin language which became the official language of the Kingdom of the True North. The record first tells of how Rhodri was born at his father's cow pens as told by his mother, his musings growing up on the hills that surrounded the Cooleys and how different it was in his old life, of how with the help of his mother he developed a trend amongst his people which separates them to the rest of the Wildlings, the Tartan cloaks and the Beret fur cap, how he helped his father to chieftaincy and conquest of the other tribes surrounding the Cooleys to his rise as King of the True North.
The Ailpin language was a branch of the Old Tongue that developed at the Cooleys even before the birth of Rhodri's father, it was different than the guttural and rough Old Tongue variant used by the rest of the people's Beyond the Wall as the Ailpin tongue is more musical in a sense but still certain words in the Ailpin can be traced back to the Old Tongue like 'Magnar' and 'Marre' which means 'lord' and/or 'king' in both tongues, the names Tormund and Tudwal are one and the same just in different tones. Another convention introduced by the Ailpin language was in names, noble houses South of Westeros can trace their lineages through the use of their house names like 'Targaryen', 'Baratheon', and 'Arryn' from beyond the Wall usually the Wildlings would often use epithets to differentiate themselves that is not the case to the Ailpin, since inheritance in the Ailpin tribe is dictated by the tanistry it is only right for every family to trace their lineage three generations back and so the terms 'Map' and 'Fer', 'son of' and 'daughter of' were introduced, house names were introduced with the trade with Braavos, the aftermath of the Northern Campaign, and by Southern Hedge Knights who applied as Gallowglasses for the Kingdom of Hengledd.