Has anyone ever seen an example of an Altar Poem, or have a link where i might find one?

My source (http://jdc-concrete.com/TERMS.HTM#inflexiv) defines an Altar Poem as follows:

"in English poetry from the Renaissance a poem where the verses or stanzas take the form of the subject of the poem (Wither, Quarles, Benlowes, Herrick and Herbert)"

these sound interesting, if i'm understanding the concept correctly (and am i wrong in assuming that the original altar poem, from which the name was derived, was about/in the form of an altar? anyone have access to the poem itself?)

TIA
b