About Frisian Language
According to Wikipedia.org, The Frisian language is closely linked to English. It was formally spoken in the province of Noord-Holland and the Netherlands. This language is mainly spoken in three small areas and each one of them has its dialect. These dialects are West Frisian that is spoken in the province of Friesland. This province is located in the Netherlands. East Frisian is spoken in the Saterland west of Oldenburg, Ger.; and North Frisian. The written records are available from the end of the 13th century. However, they are written in Old Frisian and this stage of language ended in the 16th century. The Old Frisian has all the features that distinguish English and Frisian from other languages in Germany. Even though the Frisian language has been the written language for about 300 years. There have been a lot of changes made in the modern era.
About Icelandic Language
According to Wikipedia.org, Icelandic is the official North Germanic language. It is spoken by over 314,000 people in the world. Most of the native speakers are living in Iceland where it is considered the national language. However, this language is a little more conservative as compared to other German languages. This language features western Norwegian dialects. Even the four cases synthetic grammar is also unique. Surprisingly, the written form of this language is not changed much since the 13 century. Icelandic is also quite similar to Faroese especially the written form. It remains distinctive when compared with English and German. Apart from the native speakers in Iceland, this language is also popular in Denmark. Icelandic is spoken by 8000 people in Denmark and around 1400 in Canada.