Quoting Ray Brown <[log in to unmask]>:

> > This is only
> > because historically, they were single sounds. English /dZ/ was once
> > [j].
> Not in English it wasn't. The sound came into English from Norman French
> as [dZ] (in modern French, the old French [dZ] has become simply [Z]). The
> Old French affricate [ts] simply became [s] in English borrowings, as
> neither Old English nor Middle English (nor modern English) has the
> affricate [ts].

I thought OE had /dZ/? Spelt as 'cg', in at least some circumstances?

Lalaith's page on Rohirric says so, at any rate.