John Trapp on Psalms 132:17

Verſ. 17 There will make the horn of David to bud] A metaphor from thoſe living creatures, quorum ramoſa ſunt cornua which have ſnags in their heads (as Deer have) which are unto them in ſtead of boughs. For horn, ſome read beam of David, confer Luk. 1.78.

I have ordained a Lamp] i. e. A ſucceſſor (— cui lampada tradat) and that a glorious one at length, Chriſt, who is [non-Latin text not transcribed] Light eſſentiall, Joh. 12.46. Of Aſcanius the ſon of Aeneas, and likewiſe of Tullus Hoſtilius, it is ſtoried, that light flames were ſeen about their heads, when they lay in their cradles; and that thereby was foreſignified, that they ſhould bee Kings.