At least two rubricators worked together in sequence to write the red-ink chapter headings in line spaces left by the scribe and red-ink paraph marks next to the scribe's chapter numbers in the margins.
It is not surprising to find evidence of rubricators improvising with chapter headings, since such small variations abound in chapter headings of the MEPB manuscripts, but the repeated chapter headings of Rauner MS 003183 do give us a glimpse of the degree and kind of change that can characterize any individual manuscript's rubrication.
London, British Library MS Royal 18.A.ix and San Marino, Huntington Library MS HM 131, two AV-1419:A(c) manuscripts of the MEPB, show rubrication styles similar to those of the second rubricator of MS 003183.
The two decorated initials on the page, a three-line-height T at the beginning of the Prologue heading after the Exordium and a similar S at the beginning of the Albina text proper, are both monochromatic blue, with red pen flourish done by a rubricator, not the limner.
The first three quires of the original manuscript (excluding the table of contents), comprising folios 6-29, were rubricated by the hand I am calling Rubricator 1, whose graph of the letter y is distinctive, like a thorn without the ascender, and whose paraph marks imitate the finial style of the red and blue initials, with lines that terminate in a delicate rounding.
The second time that Rubricator 1 comes to a scribal miscue, the omission of chapter 51 on folio 22r, again at a quire changeover, we get a glimpse of collaboration of some kind with Rubricator 2.
The chapter headings and paraphs in the three quires by Rubricator 1 feature a hand with disciplined vertical aspect but sometimes an inability to make the headings fit the spaces left for them.
Nevertheless, Rubricator 2 makes a glaring error in the Cadwallader chapters, writing the wrong red-ink headings on folios 39r to 41r for chapters 96 to 100 (cf.
Two subtle interventions in headings for chapters 96 and 97, made by the rubricator apparently in response to scanning words in the surrounding text, give the only hints of the actual subject matter on this page.