Shishupal was the paternal cousin of Krishna born with an abnormality..the three eyes and four arms along with three faces...his mother delivered him with lot of problems and when she saw hhis appearance.. Decided to kill him.. An oracle 's voice appeared out of nowhere and told her not to kill the child as his defects would disappear the moment the person who is his nemesis touched him.. His mother Mahasamaradij( vasudev's sister) would make all her visitors and attendants touch the child in the hope that one day the identity of his nemesis would come to light.. But it didn't happen very soon..but the unscheduled visit of Krishna and the touch of his golden hand relieved the child of his extra fittings.. Shishupal's mother realising that her nephew would kill her beloved son..asked him for a boon.. Begged him for mercy.. Krishna , the merciful lord allowed his human cousin 100 transgressions..the seed of problems between sishupal and Krishna was planted here...
As shishupal grew up, his hatred towards Krishna grew in equal proposition..shishupal started making the enemies of Krishna his friends and his tirade against him grew leaps and bounds ... By encouraging jarasandha (another Krishna hater) to advance his forces towards mathura to conquer and bring Krishna to his knees... Jarasandha couldn't succeed even after 17 attempts...though the nefarious activities against Krishna continued , the break point on their relationship came when Krishna eloped with Rukmini,the intended bride of shishupal .Rukmi ,the brother of Rukmini had fixed her marriage along with shishupal ( his bosom friend) when he knew that Rukmini's affections lay with Krishna. She refused to marry shishupal and pleaded to the lord to come to her rescue through a letter by her teacher's hand expressing her love.. Rukmi knowing that a missive had been sent locked Rukmini and put her under barriers...Krishna couldn't refuse help to a damsel in distress 's loving call.. So carried Rukmini away from her own kingdom to his and made her his bride.. This in short is about Rukmini and krishna's love story ..This incident along with krishna's strategy to shift the yadava clan 's capital to Dwarka(island capital) after the incessant jarasandha's attacks made shishupal more envious .. He started telling people about the supposed cowardice of Krishna about facing his enemy ..
All the attacks on his person and his characters was borne by Krishna with fortitude due to the promise he had given his aunty..It is said that every evil has its day of judgement..so did Shishupal's vendetta against krishna..on the day of Rajasuya yagna conducted by the pandavas to celebrate the formation of their capital indraprastha.. Shishupal was invited along with the other kings and the Brahmanas to grace the yagna..every yagna selects its guest of honour among the attendees ,the selection done by voting helps the host king to honour the most revered among them..Bhishma suggested krishna's name for this honour..majority of them applauded the suggestion but there was vehement opposition too from a minority lead by shishupal ..The elders of the court tried to reason with and cajole shishupal to get his agreement on this matter.. But in vain.. Arjuna was very upset at this slur to Krishna's honour. He decided to challenge shishupal to a battle but to be dissuaded by krishna into staying calm.. Calm it was.. But a calm before a storm..shishupal took this as a victory for his intentions .. He started bad mouthing bhishma first calling him impotent et al.. This added fuel to arjuna's anger to be again pacified by Krishna. Emboldened by this surprise silence.. Sishupal started his verbal tirade against Krishna , attacking his character, his bravery, his supposed cowardice , his weakness for women,then went to his parents, his family , his upbringing in a cowherd's house .. It went on and on ..till it finally reached a stage where the tirade started against Rukmini too..Krishna was smiling benignly through the entire drama with patience ..
The entire Mahasabha watching the proceedings with dismay as they were not coherent with the working of krishna's mind..they were wondering at krishna's stoic silence and Shishupal's damaging tirade.. What was Krishna doing here? He was basically counting number of attacks.. The last few of them were completely unacceptable ones about krishna's relationship with his wife..the moment the tirade reached its 100 count..the sudrashan chakra appeared out of thin air .. The sudrashan chakra which was bidding it's time for the call of its master.. Responded to krishna's command.. Flew past the very people he was insulted in front off the Mahasabha to finds its victim's head to slew..that is sishupal 's head..this brought an end to Shishupal's tyranny and krishna's patience to insults against his person ..