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We present our analysis of 6 years of ESPaDOnS spectropolarimetry of themagnetic $\beta$ Cep star $\xi^1$ CMa (B0.7 IV). This high-precisionmagnetometry is consistent with a rotational period $P{\rm rot} >$ 40 yr.Absorption line profiles can be reproduced with a non-rotating model. Weconstrain $R_*$, $L_*$, and the stellar age via a Baade-Wesselink analysis.Spindown due to angular momentum loss via the magnetosphere predicts anextremely long rotational period if the magnetic dipole $B_{\rm d} > 6$ kG, astrength also inferred by the best-fit sinusoids to the longitudinal magneticfield measurements $B_{\rm Z}$ when phased with a 60-year $P_{\rm rot}$.

$\xi^1$ CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star