The first line of Ortírielyanna, Tolkien’s translation of the Sub Tuum Praesidium prayer. The first word Ortírielyanna “to thy patronage” is 2nd-person-polite (-lya “thy”) ablative (-nna “to”) form of ortírië “patronage”. The second word rucimmë “we fly” is the 1st-person-plural-exclusive inflection (-mmë “we”) of the verb ruc- “flee”. The third word is aina “holy” and the last word is Eruontari, a name of Mary as the genetrix (female begetter) of the Son of God.
Decomposition: Broken into its constituent elements, this phrase would be:
> ortírie-lya-nna ruci-mme, Aina Eru-ontari = “✱patronage-thy-to flee-we, Holy God-genetrix”.
Conceptual Development: The first word was initially written Ortírielyanne (with final e instead of a), but Wynne, Smith and Hostetter suggested this is probably a slip (VT44/5). The third word was initially written Aini >> Aina. Tolkien considered several different Quenya translations for “Mother of God”; ignoring incomplete forms, the development was Eruamillë >> Eruontarië >> Eruontari.
Tolkien’s translation of the Sub Tuum Praesidium prayer into Quenya, composed sometime in the 1950s (VT43/7), first published in the “Words of Joy (Part Two)” article in Vinyar Tengwar #44 (VT44/5). Tolkien did not provide an English translation of the prayer; following the editors of the “Words of Joy” article, I used a modern English translation of the prayer (VT44/5).
Further discussion can be found in the analysis of the individual phrases. My analysis largely follows that of the “Ortírielyanna” section (VT44/5-11) of the “Words of Joy” article.