The Gupta emperor Chandragupta-I married a Lichchavi princess Kumara Devi, who was the heiress to the throne of the Lichchavis and by her marriage with Chandragupta the two states got united.

Alexanderinvaded India in 326 BC. In 326 BC, the Battle of Hydaspes was fought between Alexender the great and Porus along the banks of Haydaspesriver( Jhelum river) in Punjab.

Mahapadmananda(345 BC – 329 BC) was the founder of Nanda dynasty. Mahapadmananda was also known as Ekarat and Sarvakshatrantaka. 
According to Mahabodhivamsa, Dhana Nanda (Sanskrit: धनानन्द) was the last ruler of the Nanda dynasty.

Nandivardhan (367 BC–345 BC) was the last ruler of this Shisunaga dynasty.

Bimbisara during the late 5th century BC also known as Seniya or Shrenika in the Jain histories was a King of Magadha  and belonged to the Haryanka dynasty.He was the son of Bhattiya. His expansion of the kingdom, especially his annexation of the kingdom of Anga to the east, is considered to have laid the foundations for the later expansion  of the Maurya Empire.

The Northern Panchalas had their capital at Ahicchatra. On the other hand, Southern Panchalas had their capital at Kampilya.

The Mahabharata by Vedvyas is the longest epic of the world consists of 1,00,000 shlokas.

In Atharva Veda, the priest is Brahma.

The Satapatha Brahamana states that the wife is half her husbandand completes him.

Manu Smriti is the oldest Smriti.

Manusmṛti is the most important and earliest metrical work of the Dharmaśāstra textual tradition of Hinduism.The text presents itself as a discourse given by Manu, the progenitor of mankind, to a group of seers, or rishis, who beseech him to tell them the "law of all the social classes" . Manu became the standard point of reference for all future Dharmaśāstras that followed it. According to Hindu tradition, the Manu smruti records the words of Brahma.