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We present a multi-frequency study of PKS J1222$+$0413 (4C$+$04.42),currently the highest redshift $\gamma$-ray emitting narrow-line Seyfert 1($\gamma$-NLS1). We assemble a broad spectral energy distribution (SED)including previously unpublished datasets: X-ray data obtained with the NuSTARand Neil Gehrels Swift observatories; near-infrared, optical and UVspectroscopy obtained with VLT X-shooter; and multiband radio data from theEffelsberg telescope. These new observations are supplemented by archival datafrom the literature. We apply physical models to the broadband SED,parameterising the accretion flow and jet emission to investigate the disc-jetconnection. PKS J1222$+$0413 has a much greater black hole mass than most otherNLS1s, $M_\mathrm{BH}\approx2\times10^{8}$ M$_\odot$, similar to those found inflat spectrum radio quasars (FSRQs). Therefore this source provides insightinto how the jets of $\gamma$-NLS1s relate to those of FSRQs.

The relativistic jet of the $\gamma$-ray emitting narrow-line Seyfert 1 galaxy PKS J1222$+$0413