  The quantum internet -- in synergy with the internet that we use today --
promises an enabling platform for next-generation information processing,
including exponentially speed-up distributed computation, secure communication,
and high-precision metrology. The key ingredients for realizing such a global
network are the distribution and storage of quantum entanglement. As
ground-based quantum networks are likely to be based on existing fiber
networks, telecom-wavelength entangled photons and corresponding quantum
memories are of central interest. Recently, $\rm^{167}Er^{3+}$ ions have been
identified as a promising candidate for an efficient, broadband quantum memory
at telecom wavelength. However, to date, no storage of entangled photons, the
crucial step of quantum memory using these promising ions, $\rm^{167}Er^{3+}$,
has been reported. Here, we demonstrate the storage and recall of the entangled
state of two telecom photons generated from an integrated photonic chip based
on a silicon nitride micro-ring resonator. Combining the natural narrow
linewidth of the entangled photons and long storage time of $\rm^{167}Er^{3+}$
ions, we achieve storage time of 1.936 $\mu$s, more than 387 times longer than
in previous works. Successful storage of entanglement in the crystal is
certified by a violation of an entanglement witness with more than 23 standard
deviations (-0.234 $\pm$ 0.010) at 1.936 $\mu$s storage time. These results
pave the way for realizing quantum networks based on solid-state devices.
