After the death of king Pandu, his eldest son, Yudhisthira, became the lawful King. Duryodhana was very jealous, he wanted the kingdom. The kingdom was so divided into two halves between the Pandavas and the Kauravas. Duryodhana still was not satisfied with his share. He wanted the entire kingdom for himself. He tried several evil plots to kill the Pandavas and take away their kingdom. Somehow he took over the entire kingdom of the Pandavas and refused to give it back without a war. All peace talks by Lord Krishna and others failed, so the big war of Mahabharata could not be avoided.