Has anyone back-calculated previous close encounters between the Apophis asteroid and Earth? The Apophis asteroid was only discovered in 2004, and shares an orbit similar to Earth's orbit, leading to many close encounters on the scale of decades.
Most of the stories about this asteroid are about predicting future encounters between Earth and Apophis.  It occurs to me that you can use the same models that predict future encounters to show past encounters as well.
Has anyone done this, and shown any past events when the asteroid has come extremely close to the Earth?
The JPL Small Body Database lists Apophis close approaches dating back 100 years before discovery.
Three fairly close ones were:

1907-04-13, 0.029 au
1949-04-14, 0.028 au
1990-04-14, 0.033 au

While it's possible to run a dynamical integrator arbitrarily far backward or forward in time, any given pos(t), vel(t) state is only a point in a cloud of possibilities.
Observations (MPC database, NASA news) constrain that cloud; close encounters accelerate its dispersion.
Specific predictions before ~1900 or after ~2050 should not be regarded with much confidence.