  The growing interest in the "Medieval Climate Anomaly" (MCA) and its possible
link to anomalous solar activity has prompted new reconstructions of solar
activity based on cosmogenic radionuclides. These proxies however do not
sufficiently constrain the Total Solar Irradiance (TSI) range, and are often
defined at low temporal resolution, inadequate to infer the solar cycle length
(SCL). We have reconstructed the SCL (average duration of 10.72 \pm 0.20 years)
during the MCA using observations of naked-eye sunspot and aurora sightings.
Thus, solar activity was most probably not exceptionally intense, supporting
the view that internal variability of the coupled ocean-atmosphere system was
the main driver of MCA.
