  We report synthesis, crystal structure and superconductivity in ThCr2Si2-type
LaFe2As2 (La122). La122 was synthesized at 960{\deg}C for 1.5 h under a
pressure of 3.4 GPa. An as-synthesized La122 (non-superconductor) had a
collapsed tetragonal structure with a short c-axis length of 11.0144(4) {\AA}
as observed in CaFe2As2 under pressure. The collapsed tetragonal transformed
into an uncollapsed tetragonal by annealing the as-synthesized La122 at
500{\deg}C. The c-axis length remarkably extended to 11.7317(4) {\AA} and
superconductivity emerged at 12.1 K in the uncollapsed tetragonal La122. A
cylindrical hole-like Fermi-surface around the {\Gamma} point that plays an
important role for an s+-wave paring in iron-based superconductors was missing
in the uncollapsed tetragonal La122 due to heavily electron-doping.
Superconductivity in La122 may be closely related to that induced in CaFe2As2
under pressure.
