Vasumitra (born ???, reigned 131–124 BCE, died 124 BCE), was the fourth King of the Sunga Dynasty of Northern India. He was the son of Agnimitra

Agnimitra

Agnimitra was the second King of the Sunga Dynasty of northern India. He succeeded his father, Pusyamitra Sunga, in 149 BCE...

 by his queen Dharini, and a brother or half-brother of Vasujyeshtha

Vasujyeshtha

Vasujyetha was the third King of the Sunga Dynasty of Northern India. His reign was not well documented, thus little is known about him. He is credited with successfully completing his grandfather's Ashvamedha and for defeating forces of the Indo-Greek Kingdom along the banks of the Sindhu River...

.

In the Malavikagnimitram

Malavikagnimitram

Mālavikāgnimitram is a Sanskrit play by Kālidāsa. It is his first play.The play tells the story of the love of King Agnimitra, the Shunga king of Vidisha , for the beautiful hand-maiden of his chief queen. He falls in love with the picture of an exiled servant girl named Mālavikā...

 (Act V, Verse 14), Kalidasa tells us that Vasumitra guarded the sacrificial horse

Horse

The horse is one of two extant subspecies of Equus ferus, or the wild horse. It is a single-hooved mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature into the large, single-toed animal of today...

 let loose by his grandfather Pushyamitra, and he defeated the armies of the "Yavana" (or Indo-Greeks) on the banks of the Sindhu River.

Bana's Harshacharita mentioned him as Sumitra and informed us that he was killed by Mitradeva (or Muladeva, according to some manuscripts) while enjoying a drama. He was succeeded by Andhraka, Antaka, Bhadraka or Bhadra

Bhadra

In Hinduism, Bhadra is a goddess of the hunt and one of Shiva's servants....

 according to different Puranas.