The Mandloys are the descendants of Jadaun Rajputs of princely state of Karauli , Rajasthan. Mandloi is the title awarded to the Mandal Head by enrobing a veil (लोई) thats why comes the name  "Mandloi".

---------------------------------------------------------------------------------------------------- History of Jadaun Rajputs :

Jadons(Jadaun) Rajputs are the Chandrawanshi Rajputs;descendant of the Hindu mythological character  Yadu and as the descendents of Yadu, they are classified as Yaduwanshi under the Chandrawanshi  branch of the Rajput hierarchy.

Jadauns are among the 36 royal clans of Rajputs.

The rulers of the princely state of Karauli belonged to the Jadaun clan.Basically ruler of Karauli  came from Byana. Karauli State was a 17 Gun Salute during British time. The princely state of Karauli was founded about 995 by Raja Bijai Pal a Jadaun ruler.

The Kuldevi of Jadaun is Kaila Devi at Karauli (Rajasthan).

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The Mandloi Linage - 

The princely state of Karauli was ruled by Raja Bijai Pal a Jadaun ruler in about 995 AD. Raja Bijai Pal had 12 sons; so the 12 branches were formed and these 12 branches of Jadaun thakurs  were settled all across India. majorly in Madhya Pradesh and Uttar Pradesh.   
 Shri Devji Mandloi was the first man who was awarded the title "Mandloi" in 1710 in a village called  Bhangia [M.P.]  and he was appointed as the justice of the Mandal. At that time social justice was done by the Mandal and chief justice had all the powers.