Rolling bearing for a blade root extending in a longitudinal direction between a proximal end and a distal end, the rolling bearing allowing oscillation of the root about an axis extending in the longitudinal direction relative to a housing, the rolling bearing comprising: - at least one outer ring having an inner surface and an outer surface opposite the inner surface, the inner surface of the outer ring having at least one outer race (35, 36), - at least one inner ring having an inner surface and an outer surface opposite the inner surface, the outer surface of the first inner ring having at least one inner race (28, 23), an inner space being defined between the inner surface of said at least one outer ring and the outer surface of said at least one inner ring, the inner space extending between a proximal end where it is closed off by a proximal sealing system between at least one outer ring and at least one inner ring and a distal end where it is closed off by a distal sealing system between at least one outer ring and at least one inner ring, - at least one row of rolling elements (48, 49) mounted in the inner space, rolling on the outer and inner races (35, 36, 28, 23), - a retaining system of the distal sealing system, comprising a retaining body, and a thread/tapping system formed on a peripheral assembly surface of the retaining body on the one hand and on a peripheral surface of one of the inner and outer rings facing the peripheral assembly surface of the retaining body on the other hand, the retaining body being screwable into a retaining position in which an axial abutment surface of the retaining body forms an axial stop for the distal sealing system in the longitudinal direction in the proximal->distal direction. - at least one outer ring having an inner surface and an outer surface opposite the inner surface, the inner surface of the outer ring having at least one outer race (35, 36), - at least one inner ring having an inner surface and an outer surface opposite the inner surface, the outer surface of the first inner ring having at least one inner race (28, 23), an inner space being defined between the inner surface of said at least one outer ring and the outer surface of said at least one inner ring, the inner space extending between a proximal end where it is closed off by a proximal sealing system between at least one outer ring and at least one inner ring and a distal end where it is closed off by a distal sealing system between at least one outer ring and at least one inner ring, - at least one row of rolling elements (48, 49) mounted in the inner space, rolling on the outer and inner races (35, 36, 28, 23), - a retaining system of the distal sealing system, comprising a retaining body, and a thread/tapping system formed on a peripheral assembly surface of the retaining body on the one hand and on a peripheral surface of one of the inner and outer rings facing the peripheral assembly surface of the retaining body on the other hand, the retaining body being screwable into a retaining position in which an axial abutment surface of the retaining body forms an axial stop for the distal sealing system in the longitudinal direction in the proximal->distal direction.