Portuguese to English Art/Literary Poetry & Literature

This is part of a line from the poem "Camoes e D. Branca" by Almeida Garrett. My problem is that I'm not sure I'm interpreting "qual" correctly in this context.

Here's the whole extract:
"Em tôda a pompa e luxo de suas galas
Sintra, a formosa Sintra se amostrava
Ao monarca das luzes - **qual princesa**
Do Oriente ao régio noivo se apresenta,
Voluptuosos perfumes exalando
Das longas sêdas com que brinca o zéfiro."

Which I am rendering so far as:
"In all the pomp and luxury of her formal dress
Sintra, comely Sintra, displays herself
To the monarch of the lights – which princess
From the East displays herself to the royal bridegroom,
..."

In other words, "which princess from the East" is equivalent to "who".
Opinions - and suggestions for making "which princess" less clumsy - would be gratefully received.