Rajpurohit Vikram Singh Harpalot (fl. 15th–16th century) was a distinguished warrior, diplomat, and tikayat of Rao Bika, the founder of the Bikaner Kingdom. He was the seventh and youngest son of Thakur Damaji Harpalot, a noble of the esteemed Sewad Rajpurohit lineage.

His father was Tikayat of Jodhpur State and Thakur of Tinwari, holding multiple jagirs under his control, commanding great respect and influence in the Marwar court. Vikram Singh’s upbringing emphasized loyalty, administrative wisdom, and martial skills, reflecting the Rajpurohit community’s dual ethos of scholarship and warrior traditions.

In a defining act of true friendship and loyalty, he left Jodhpur to accompany Rao Bika (Rao Jodha’s son) in establishing the new kingdom of Bikaner.

When Rao Bika (1465–1504 CE) left Jodhpur, his uncle Kandhalji and his advisor Rajpurohit Bikamsi also left for Jangaldesh. They showed bravery and provided strategic guidance in several skirmishes and battles during the establishment of the Bikaner kingdom.

Vikram Singh’s military and diplomatic prowess proved instrumental in Rao Bika’s campaigns. He spearheaded battles against rival clans, including the Jats, Balochs, Bhatis, and Pathans, securing key territories like Pugal, Janglu, and Dronpur. His strategies for tax collection (khiraj) and guerrilla warfare bolstered Bikaner’s economy and defenses.

However, Rao Jodha refused to help. The reason dated back to a prior incident when Hadi Rani had asked Rao Bida for the Ladnun Pargana, but Rao Bida had declined her request. Because of this, Rao Jodha denied military support. As a result, Rajpurohit Bikamsi returned without any aid.

Subsequently, after receiving strategic advice from Kandhalji, the Mohils, and Rajpurohit Bikamsi, Rao Bika launched an attack on Dronpur Chhapar, successfully reclaimed the territory, and handed it back to his brother Rao Bida.

Rajpurohit Bikamsi was also sent to Jodhpur as a diplomat to retrieve religious and ancestral articles from the Jodhpur ruler. However, the ruler refused to hand them over.

Following this, Rao Bika attacked Jodhpur against Rao Suja of Marwar and brought those articles to Bikaner, including the idol of Nagnechi Mata, the royal throne of Rao Jodha, and his sword.

When Rao Bika and his army marched to the battlefield to annex Dronpur Chhapar, he appointed Rajpurohit Bikamsi as the Governor of the Parganas of the Bikaner state.

Rajpurohit Bikamsi was entrusted with the inspection, management, and security of the Bikaner region during the absence of Rao Bika.

Various thakurs of Bikaner betrayed Rao lunkaran, Bikamsi ji fought them and died fighting during the invasion on Dhosi of Narnaul paragana (which was under the territory of Delhi. Hassan, father of shershah suri was given charge of Narnaul  by Jamal khan. Delhi was reigned by Sikandar lodi at that time). on sawan badi 4, vik. Sam. 1583 (1516-17) His canopy is still in village Dhosi. So basically Bikamsi died fighting against Sikandar lodi.

In 1488 CE (Vikram Samvat 1545), Vikram Singh was awarded the village of Tidi Bigga for his services. He later distributed lands among his seven sons, establishing them as feudal lords and administrators:

1. Devidas – Toliyasar

2. Bherodas –Randhisar, Bidasar

3. Taroji – Nosariya

4. Mohandas (Mahaji) – Kolasar

5. Sevaji – Rajviyasar, Ratasar

6. Lakhoji – Details unrecorded

7. Surjoji – Details unrecorded

He was granted a jagir of 84 villages in the Ridi region, but later, his son exchanged these 84 villages for the Thikana of Toliyasar, which had 84,000 beeghas of land.

In addition, Bikam Singh Ji held 8 other jagirs and some land in Bidasar apart from the Thikana of Toliyasar. The Thikana of Toliyasar was given to his eldest son, Devidas.