erst (adv.) 1
formerly, once, before
2H6 II.iv.13 [Gloucester as if to Duchess] The abject people gazing on thy face ... / That erst did follow thy proud chariot wheels
H5 V.ii.48 [Burgundy to King Henry and the French King] The even mead, that erst brought sweetly forth / The freckled cowslip
Per I.i.50 [Pericles to Antiochus] sick men ... / Gripe not at earthly joys as erst they did
Sonn 12.6 [] When lofty trees I see barren of leaves, / Which erst from heat did canopy the herd
Tit V.iii.79 [Marcus to Lucius, of Aeneas] Speak, Rome's dear friend, as erst our ancestor ... did discourse