  We report on two pion-photoproduction measurements in the threshold region
conducted in the A2 collaboration at MAMI with the almost 4{\pi} Crystal Ball
detector. The first was with a linearly polarized photon beam and unpolarized
liquid-hydrogen target. The data analysis is now complete and the linearly
polarized beam asymmetry along with differential cross sections provide the
most stringent test to date of the predictions of Chiral Perturbation Theory
and its energy region of convergence. More recently, a measurement was
performed using both circularly polarized photons and a transversely polarized
butanol frozen-spin target, with the goal of extracting both the target and
beam-target asymmetries. From these we intend to extract {\pi}N scattering
sensitive information for the first time in photo-pion reactions. This will be
used to test isospin conservation and further test dynamics of chiral symmetry
breaking in QCD as calculated at low energies by Chiral Perturbation Theory.
