A mooring post unit comprising a mooring post and a cable holding device on top of the mooring post, the cable holding device comprising - a first pulley wheel, a second pulley wheel and a cable clamp, arranged to guide a mooring cable from a ship over the first pulley wheel to the clamp, back and forth via the second pulley wheel, - a hydraulic force limiter (120, 122) coupled between the second pulley wheel and the mooring post, with a rotation axis of the second pulley wheel mounted on the hydraulic force limiter (120, 122) transverse to a direction of motion of the hydraulic force limiter (120, 122), wherein the hydraulic force limiter (120, 122) is expandable and compressible, the hydraulic force limiter (120, 122) being configured to start limiting a reaction force from the hydraulic force limiter (120, 122) in response to force exerted by the second pulley wheel as a result of a pulling force on the mooring cable during expansion or compression of the hydraulic force limiter (120, 122) when the pulling force exceeds a predetermined threshold, characterised in that the clamp comprises a cable clamping device, the cable clamping device comprising - a first rotatable friction drum, having a first axis of rotation; - a second rotatable friction drum, offset from the first rotatable friction drum in an offset direction transverse to said first axis of rotation, the second rotatable friction drum having a second axis of rotation, the first and second axis of rotation (300, 302) having a rotation relative to each other around said offset direction; - the first and second friction drum (30, 32) defining a mooring cable path that runs back and forth between the first and second friction drum (30, 32) alternately in successive semi-circles around the first and second rotatable friction drum (30, 32); - wherein an angle of the relative rotation of the first and second rotation axis (300, 302) is so that intersections of the mooring cable path with a virtual plane perpendicular to said offset direction, on opposite sides of the second rotatable friction drum (30, 32), are at least approximately offset in the direction of the first axis of rotation by a pitch of the mooring cable path; - a motor or motors arranged to drive rotation of the first and second rotatable friction drums (30, 32), synchronously around the first and second rotation axis (300, 302) respectively. - a first pulley wheel, a second pulley wheel and a cable clamp, arranged to guide a mooring cable from a ship over the first pulley wheel to the clamp, back and forth via the second pulley wheel, - a hydraulic force limiter (120, 122) coupled between the second pulley wheel and the mooring post, with a rotation axis of the second pulley wheel mounted on the hydraulic force limiter (120, 122) transverse to a direction of motion of the hydraulic force limiter (120, 122), wherein the hydraulic force limiter (120, 122) is expandable and compressible, the hydraulic force limiter (120, 122) being configured to start limiting a reaction force from the hydraulic force limiter (120, 122) in response to force exerted by the second pulley wheel as a result of a pulling force on the mooring cable during expansion or compression of the hydraulic force limiter (120, 122) when the pulling force exceeds a predetermined threshold, characterised in that the clamp comprises a cable clamping device, the cable clamping device comprising - a first rotatable friction drum, having a first axis of rotation; - a second rotatable friction drum, offset from the first rotatable friction drum in an offset direction transverse to said first axis of rotation, the second rotatable friction drum having a second axis of rotation, the first and second axis of rotation (300, 302) having a rotation relative to each other around said offset direction; - the first and second friction drum (30, 32) defining a mooring cable path that runs back and forth between the first and second friction drum (30, 32) alternately in successive semi-circles around the first and second rotatable friction drum (30, 32); - wherein an angle of the relative rotation of the first and second rotation axis (300, 302) is so that intersections of the mooring cable path with a virtual plane perpendicular to said offset direction, on opposite sides of the second rotatable friction drum (30, 32), are at least approximately offset in the direction of the first axis of rotation by a pitch of the mooring cable path; - a motor or motors arranged to drive rotation of the first and second rotatable friction drums (30, 32), synchronously around the first and second rotation axis (300, 302) respectively.