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As a matter of fact, ""Mozzafar"" is incorrect; it must be ""Mozaffar""; tashdid is on ""f"" and not on ""z"". Further, ""ad-Din"" is better than ""od-Din"" and both are better than ""al-Din"". In point of fact, even in Arabic ""al-Din"" is not pronounced ""al-Din""; the letter ""D"" in ""Din"" is a so-called Shamsi letter (to be contrasted with so-called Ghamari letters) whereby the ""al"" in ""al-Din"" renders the ""D"" in ""Din"" a moshadad ""D"" (i.e. a ""D"" with a tashdid), at the expense of ""l"" itself not being pronounced (in this connection, note the two ""d""s in ""ad-Din"", one in ""ad"" and the other in ""Din""). For details concerning Shamsi and Ghamari letters, consult this page. To summarise, the correct transliteration is Mozaffar ad-Din Shah. I must add that in Persian vernacular, one often pronounces the name as Mozaffar ed-Din Shah (note the ""e""). "