who are gaur brahmins ?

Who are gaur brahmins?
Gaur Brahims are the Brahmins originated from a small village of west Bengal and Bengal desh border the name of that village is GAUR or GOUR located at 24°52′N, 88°08′E near the Indo-Bangladesh international border It was founded by Lakshmana and was given name as Lakshmanavati letter it was known as Gouda and then Gour after the Muslims invaded Bengal in 11th century the brahmins moved to the northern INDIA 
I am not very sure but some people says that Gaur Brahmins were given land and houses by North INDIAN kings to settle down based on their knowledge on spirituality and VEDAS
Gaur Brahmin as stated above belong to Bengal. I am not aware of Muslim invasion/persecution. But to my mind King Parikshit (son of Abhimanu and Uttara) and Grandson of Arjuna was the last King of Dwaper Yuga. Rather it is said that Kaliyug started within the time of King Parikshit. Parikshit did a Maha Yajna for which he was advised by rishis that to perform that yajna GAUR Brahmans are needed. Thus Parikshit invited Gaur Brahmans from west bengal. After the Yajna was over the Brahmins asked to return to their native place. But were requested to stay there by King Parikshit. The Brahmins then questioned Parikshit that there are not suitable brahmin girls available in his kingdom and hence how will the continue there clan/Vansh. On this Parikshit offered them to marry the royal girls( daughters, sisters of royals). This is why on a comparative Gaur Brahmins are a bit more arrogant then rest.
I do not have any proof of what I said above but it is what my forefathers used to explain to me.

Note - The history of the caste system in Bengal is very interesting. Broadly speaking, all the Brahmans of Bengal belong to the same community - Gaudiya Brahman. Whereas in the case of Kshatriyas / Kayasthas, they are subdivided into three main divisions in Bengal - 1) Vangaja Kayasthas (Eastern Bengal). 2 & 3) Uttar Rarhi and Dakshin Rarhi Kayasthas (Western Bengal).