Shakyapura
Sakyapura (शक्यपुर) is a city mentioned by Mahabharata (II.25.9) in north of Indraprastha.
Jat clan
In Mahabharata
Arjuna was sent to North by Yudhisthira to subjugate kingdoms for the Rajasuya Yagya, after crowning as the Emperor of Indraprastha.Sabha Parva, Mahabharata/Book II Chapter 24 & Sabha Parva, Mahabharata/Book II Chapter 25 tell us countries Arjuna subjugated. The list includes: Shakyapura (शक्यपुर) and Singhapura (town) (सिंहपुर) in addition to many countries. So from Mahabharata we know that Singhapura was in the north of Indraprastha.