When Joseph Freiherr von Eichendorff ended to be the spouse with Aloysia von Eichendorff?
SELECT ?value WHERE { wd:Q77204 p:P26 ?s . ?s ps:P26 wd:Q15990518 . ?s pq:P582 ?value}
joseph von eichendorff: Q77204 aloysia von eichendorff: Q15990518