Question about historical Japanese kana usage.

In the process of learning the hira- and katakana, I
hit upon something that made me very curious indeed.
There were kana for the syllables 'we', 'wi' and 'wo'
(pronounced these days as 'o'; the other two have
simply been replaced by 'e' and 'i'), but there's no
kana for 'ye'. 'Ye' as a syllable existed in Japanese,
as in the obsolete names 'Yedo' (now 'Edo') and 'yen'
(now 'en').

How did the Japanese express the syllable 'ye'? Or did
they at all?

Replies