There were occasional disputes among the courts when there were disagreements about what court was the proper place to hear a certain issue. For example, the ecclesiastical courts claimed they had the right to enforce contracts that were formalized by oath, as they involved a spiritual matter of whether the oath had properly been made, though common lawyers disagreed. In some instances, however, the non-common law courts were able to provide relief where the common law courts could not. The Chancery, unlike the common law court, could provide remedies in cases involving trusts and uses and could give relief based on fraud, accident, or mistake to plaintiffs. As courts of equity provided new relief that before had been encompassed by but limited in the common law courts, writs of prohibition helped prevent plaintiffs from being able to "forum shop" for the court that would be most favorable to their position. Any plaintiff who could gain adequate relief in a common law court was prohibited from bringing his case in a different court, even if he preferred the procedure, allowable defenses, or possible remedies of a different court.