  We present multiwavelength observations and a model for flat spectrum radio
quasar NVSS J141922-083830, originally classified as a blazar candidate of
unknown type (BCU II object) in the Third Fermi-LAT AGN Catalog (3LAC).
Relatively bright flares (>3 magnitudes) were observed on 21 February 2015 (MJD
57074) and 8 September 2018 (MJD 58369) in the optical band with the MASTER
Global Robotic Net (MASTER-Net) telescopes. Optical spectra obtained with the
Southern African Large Telescope (SALT) on 1 March 2015 (MJD 57082), during
outburst, and on 30 May 2017 (MJD 57903), during quiescence, showed emission
lines at 5325\r{A} and at $\approx$3630\r{A} that we identified as the Mg II
2798\r{A} and C III] 1909\r{A} lines, respectively, and hence derived a
redshift z = 0.903. Analysis of Fermi-LAT data was performed in the quiescent
regime (5 years of data) and during four prominent flaring states in
February-April 2014, October-November 2014, February-March 2015 and September
2018. We present spectral and timing analysis with Fermi-LAT. We report a
hardening of the gamma-ray spectrum during the last three flaring periods, with
a power-law spectral index $\Gamma = 2.0$-$2.1$. The maximum gamma-ray flux
level was observed on 24 October 2014 (MJD 56954) at $(7.57 \pm 1.83) \times
10^{-7}$ ph~cm$^{-2}$s$^{-1}$. The multi-wavelength spectral energy
distribution during the February-March 2015 flare supports the earlier evidence
of this blazar to belong to the FSRQ class. The SED can be well represented
with a single-zone leptonic model with parameters typical of FSRQs, but also a
hadronic origin of the high-energy emission can not be ruled out.
