Why was maximilien de robespierre executed?

Maximilien Robespierre was executed due to the excesses of the Reign of Terror which he and his supporters started.  He passed a law that suspended a suspect’s right to trial on June 4, 1794.  This law  was passed at a time when foreign invasion was no longer a threat  and this led to an alliance determine to oppose him and his allies.  He and his supporters were arrested on July 27, 1794.  Though armed supporters came to his aid, he declined to lead them.  Later, he was declared an outlaw by the National Convention.  He attempted to commit suicide but only shot his jaw.  He was guillotined on July 28.  With his death and the death of his followers the Reign of Terror came to an end.