The city of Ujjain arose as a major center in the second wave of Indian urbanization in the sixth century BC, and served as the chief city of the kingdom of Malwa or Avanti. Further east, the kingdom of Chedi lie in Bundelkhand. Chandragupta Maurya united northern India c. 320 BCE, establishing the Maurya Empire (321 to 185 BCE), which included all of modern-day Madhya Pradesh. King Asoka's wife was said to come from Vidisha- a town north of today's Bhopal. The Maurya Empire went into decline after the death of Asoka, and Central India was contested among the Sakas, Kushanas, and local dynasties during the 3rd to 1st centuries BCE. Ujjain emerged as the predominant commercial center of western India from the first century BCE, located on the trade routes between the Ganges plain and India's Arabian Sea ports. It was also an important Hindu and Buddhist center. The Satavahana dynasty of the northern Deccan and the Saka dynasty of the Western Satraps fought for the control of Madhya Pradesh during the 1st to 3rd centuries CE.