  A search for a narrow baryonic resonance decaying to $K^0_s p$ or $K^0_s \bar
p$ is carried out in deep inelastic ep scattering with the H1 detector at HERA.
Such a resonance could be a strange pentaquark \thplns, evidence for which has
been reported by several experiments. The $K^0_s p$ and $K^0_s \bar p$
invariant mass distributions presented here do not show any significant peak in
the mass range from threshold up to 1.7 GeV. Mass dependent upper limits on
$\sigma(ep \to e \thplf X)\times BR(\thplf \to K^0 p)$ are obtained at the 95%
confidence level.
