A ring lock at least comprising: - a lock housing; - a lock mechanism which is included in the lock housing; - a ring bolt having a substantially circular segment-shaped configuration, while the ring bolt is bringable in a closed position and an opened position and in the closed position is locked by the lock mechanism and through operation of the lock mechanism is released to be brought in the opened position; - a cable or chain provided with a cable pin having a cable pin circumferential groove; - a cable pin opening which is provided in the lock housing and which extends in the direction of a cable pin opening axis, in which the cable pin can be received; - a fixing element which is movably arranged in the lock housing and which is bringable in a locking position in which a fixing element flange of the fixing element extends at least partly into the cable pin opening, so that the fixing element flange in the locking position is in engagement with the cable pin circumferential groove of a cable pin introduced into the cable pin opening, the fixing element being movable through operation of the lock mechanism into an unlocking position in which the fixing element flange has been brought out of engagement with the cable pin circumferential groove; - a fixing element receiving cavity which is formed in the lock housing and in which the movable fixing element is received, the fixing element receiving cavity comprising a flange receiving cavity in which the fixing element flange is received in a manner movable from the locking position to the unlocking position and vice versa; characterized in that the flange receiving cavity on a side thereof facing the cable pin opening is provided with a chamber, whose dimension viewed in the movement direction of the fixing element flange during locking and unlocking substantially corresponds to the dimension of the fixing element flange in that direction, and wherein the fixing element is received in the fixing element receiving cavity with some play and/or is slightly deformable, such that as a result of an exertion of a pulling force on the cable pin, the fixing element flange moves into the chamber, so that movement of the fixing element being in the locking position is blocked. - a lock housing; - a lock mechanism which is included in the lock housing; - a ring bolt having a substantially circular segment-shaped configuration, while the ring bolt is bringable in a closed position and an opened position and in the closed position is locked by the lock mechanism and through operation of the lock mechanism is released to be brought in the opened position; - a cable or chain provided with a cable pin having a cable pin circumferential groove; - a cable pin opening which is provided in the lock housing and which extends in the direction of a cable pin opening axis, in which the cable pin can be received; - a fixing element which is movably arranged in the lock housing and which is bringable in a locking position in which a fixing element flange of the fixing element extends at least partly into the cable pin opening, so that the fixing element flange in the locking position is in engagement with the cable pin circumferential groove of a cable pin introduced into the cable pin opening, the fixing element being movable through operation of the lock mechanism into an unlocking position in which the fixing element flange has been brought out of engagement with the cable pin circumferential groove; - a fixing element receiving cavity which is formed in the lock housing and in which the movable fixing element is received, the fixing element receiving cavity comprising a flange receiving cavity in which the fixing element flange is received in a manner movable from the locking position to the unlocking position and vice versa;