þonne

then, at that time

then, soon afterward

then, in that case

Wōst þū þonne gyt genōh be Gode, gyf hē þē byþ cūþ swā þē is nū þes mōnan færeld — on hwilcum tungle hē nū is, oþþe on hwilce hē þanon gēþ?

Then wouldst thou know enough about God, if He should be as well known to thee as the motion of the moon—in what constellation it now is, or into which it is going next?

late 9th century, King Alfred's translation of Saint Augustine's Soliloquies

than

Forþon mē hātran sind dryhtnes drēamas þonne þis dēade līf, lǣne on londe.

Thus, Lord’s glees are dearer to me than this deadly life, fleeting on the land.

10th century, The Seafarer:

when

Þonne iċ mec onhebbe ond hī onhnīgaþ tō mē, moniġe mid miltse, þǣr iċ monnum sceal īċan upcyme ēadiġnesse.

When I raise myself up and they bow down to me, many with mercy, then I shall increase rising of happiness for men.

10th century, Exeter Book Riddle 30: