Timepiece resonator oscillating at a natural frequency, comprising one oscillating member and oscillation maintenance means, this oscillating member carrying a regulator oscillating at a regulation frequency comprised between 0.9 times and 1.1 times the value of an integer multiple greater than or equal to 2 of the natural frequency, this resonator is included in a timepiece movement for a timepiece, particularly a watch, and this regulator imposes a periodic modulation of the resonant frequency and/or quality factor and/or point of rest of this resonator.