  The top-quark mass is measured in the all-hadronic top-antitop quark decay
channel using proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$
= 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The data set
used in the analysis corresponds to an integrated luminosity of 20.2 fb$^{-1}$.
The large multi-jet background is modelled using a data-driven method. The
top-quark mass is obtained from template fits to the ratio of the three-jet to
the dijet mass. The three-jet mass is obtained from the three jets assigned to
the top quark decay. From these three jets the dijet mass is obtained using the
two jets assigned to the W boson decay. The top-quark mass is measured to be
173.72 $\pm$ 0.55 (stat.) $\pm$ 1.01 (syst.) GeV.
