I've seen the two mentioned together in another (eleventh-century?) hymn - for Christmas, cf. Prosper Guéranger. 2000. The Liturgical Year. Trans. by Laurence Shepherd. (Fitzwilliam, NH: Loreto), II, p. 220 - see below.

Not the same context, but at least shows there's precedent for finding them mentioned together, in hymns no less.

"Let the faithful choir joyfully rejoice, Alleluia!

The womb of the undefiled one hath brought forth the King of kings: a thing of wonder.

The angel of counsel is born of the Virgin, the sun of the star,

The sun that knows no setting, the star that is ever shining, ever bright.

As the star its ray, in like manner the Virgin brings forth her son.

Neither the star by its ray, nor the mother by her son becomes defiled.

The lofty cedar of Lebanon is conformed to the hyssop in our valley.

The Word, the being of the most high, has deigned to become incarnate, having assumed flesh.

Isaiah foretold it, the Synagogue remembers it, yet never does she cease to be blind.

If not her own prophets, let her at least believe the Gentiles; in the Sibylline verses these things are predicted.

O unhappy one, hasten; at least believe the ancient things.

O wretched race, why will you be condemned?

Behold the child of whom the Scripture teaches: the mother hath brought him forth.

Alleluia!"

Letabundus exultet fidelis chorus alleluia.

Regem regum intacte profudit thorus res miranda.

Angelus consilii natus est de virgine sol de stella.

Sol occasum nesciens stella semper rutilans valde clara.

Sicut sydus radium profert virgo filium pari forma.

Neque sydus radio neque virgo filio fit corrupta.

Cedrus alta Libano conformatur Ysopo calle nostra.

Verbum ens altissimi corporari passum est carne assumpta.

Ysaias cecinit, synagoga meminit nunquam tamen desinit esse ceca.

Si non suis vatibus credat vel gentilibus sibillinis versilibus hec predicta.

Infelix propera, crede vel vetera cur damnaberis gens misera quam docet littera.