Target IAP is poor-contrast checky field with poor-contrast chief, extrapolating from poor-contrast chiefs on poor-contrast multipart fields.
The source material is Insignia pontificum Romanorum et cardinalium, Parts 1-15, BSB Cod icon 266-280, Italy, 1550-1555.
Some preliminary comments about the blazons presented:
I'm blazoning DU BUBALIS as "barry lozengy" for lack of a better term. It may, however, be a lazy rendering of vairy despite good renderings of vairy being shown elsewhere.
There are a number of items I've blazoned as having a chief -- frequently a chief of allegience, though some chief candidates seem to be chiefs of their own accord (ANT_ IACOBUS seems clearly so). Trusting such fields are in fact charged with chiefs rather than simply per fess requires looking at some per fess fields. Therefore, I've included some arms that are clearly per fess, having a divided field with a single charge overlaying the whole:
DE AVERARIA: Per fess Or and argent, an eagle displayed sable.
DE CERNUSCHULO: Per fess Or and gules, a plant vert [and sable].
DE PRATO: Per fess Or and vert, and eagle displayed sable.
DE PREDA VECA: Per fess sable and argent, a horse rampant counterchanged.
Conveniently, DE AVERARIA is side-by-side with DE BASIS, which seems a close relation to DE BAZIIS. The difference between the fess line and the depth of the potential chief are notable here. These differences are at times small, but on the whole, the fess lines seems to ride a bit lower than those of prospective chiefs of allegience, which provide a basis (as it were) for what constitutes a chief in these sources.
Overall, I'm confident that at least the instances of "Or an eagle displayed sable" are traditional chiefs. I'm also confident that most of the others are in fact chiefs, hinting at a pattern of field primary armory with charged chiefs.
The following is relevant to the question of a chief sharing a tincture with a multipart field:
Philipp Hartrat. Device change. Lozengy sable and argent, a cross vert and a bordure sable. Commentary raised the issue of whether or not charges can share a tincture with a multiply-divided field. While there are several precedents allowing multiply-divided ordinaries to share a tincture with a single-tinctured field, there are no precedents addressing the reverse. Ordinaries, generally having simple outlines, are far easier to identify than other charges when sharing a tincture with the field. Therefore, as long as identifiability is maintained, we will register single-tinctured ordinaries sharing tincture with a multiply-divided field, and multiply-divided ordinaries sharing tincture with a single-tinctured field. His previous device, Or, a centaur passant reguardant sable playing a straight trumpet gules and on a point pointed sable a cross moline Or, is released. [Registered Nov 2011, via Atlantia]
None.
DE BUBALIS: Barry lozengy gules and azure, on a chief Or a bull's head cabossed sable. [plus motto]
SERLERIO: Lozengy gules and sable.
DE VITUONO: Checky sable and gules.
BONANNI: Checky Or and argent.
DE BAZIIS: Paly Or and argent, a chief Or.
DE CAPITANIIS DE LISAGO: Bendy Or and argent, on a chief Or a castle gules.
DE PUTEO: Paly gules and azure, on a chief azure mullety of eight points Or, a well [argent and Or].
DE MICHELIS: Vairy gules and azure, on a chief azure a hanging balance Or.
DE NAXIS DE PAPIA: Checky gules and azure, a lion Or.
GUGLIELMUS DE ESTOTUILLA: Quarter 1: Barry gules and sable, a lion sable.
ANT_ IACOBUS: Barry Or and argent, on a chief azure three mullets of eight points Or.
DE MARGANIS: Bendy azure and gules, on a chief Or an eagle displayed sable. [chief of allegience]
DE CARANIS: Bendy vert and gules, on a chief argent a furison sable striking a stone argent, between the letters M and A sable.
DE CERMEXANO: Bendy sinister gules and azure, on a chief argent an eagle displayed gules.
DE MEDICIS DE PROANO: Paly gules and vert, on a chief Or an eagle displayed sable.
DE PAIARANO: Paly sable, gules, and azure, on a delf argent a letter P sable, on a chief Or an eagle displayed sable.
DE POLASTRIS DE TURINO: Paly gules and azure, on a chief Or a cock sable.
CARDARINA: Barry gules and vert, on a chief Or a bird close sable.
DE BUSTI: Bendy gules and vert.
CHALBANI: Bendy Or and argent.
LISIADO: Barry Or and argent.
PIATESI: Barry gules and azure.
IO MICHAELUS: Barry gules and azure, all bezanty.
DE BON ROMERIIS: Barry gules and vert, a bend argent.
DE TREBATONIB: Paly gules and vert, a letter T argent.
DE VICINII: Barry Or and argent, a [castle? arch? aqueduct?] gules.
DE VIGIIS: Paly gules and azure, a mace Or.
BUON ROMEI: Barry gules and vert, a bend argent.
BORROMEI: Barry gules and azure, a bend argent.
GHINI: Paly Or and argent, a bend sable and a label gules.
DE AVERARIA: Per fess Or and argent, an eagle displayed sable.
DE BASIS: Bendy Or and argent, a chief Or.
DE CERNUSCHULO: Per fess Or and gules, a plant vert [and sable].
DE PRATO: Per fess Or and vert, and eagle displayed sable.
DE PREDA VECA: Per fess sable and argent, a horse rampant counterchanged.
DE VAILATE: Vairy bendwise gules and vert, on a chief Or an eagle displayed sable.
DE VICE DOMINIS: Vairy bendwise Or and argent.
200-GUGLIELMUS DE ESTOTUILLA: Quarter 1: Barry gules and sable, a lion sable.
274-IO MICHAELUS: Barry gules and azure, all bezanty.
292-ANT IACOBUS: Barry Or and argent, on a chief azure three mullets of eight points Or.
094-DE BUBALIS: Barry lozengy gules and azure, on a chief Or a bull's head cabossed sable [and motto].
160-DE MARGANIS: Bendy azure and gules, on a chief Or an eagle displayed sable.
252-SERLERIO: Lozengy gules and sable.
114-DE AVERARIA: Per fess Or and argent, an eagle displayed sable.
114-DE BASIS: Bendy Or and argent, a chief Or.
140-DE BAZIIS: Paly Or and argent, a chief Or.
170-DE BON ROMERIIS: Barry gules and vert, a bend argent.
212-DE BUSTI: Bendy gules and vert.
228-DE CARANIS: Bendy vert and gules, on a chief argent a furison sable [striking] a stone argent, between the letters M and A sable.
246-DE CAPITANIIS DE LISAGO: Bendy Or and argent, on a chief Or a castle gules.
290-DE CERMEXANO: Bendy sinister gules and azure, on a chief argent an eagle displayed gules.
290-DE CERNUSCHULO: Per fess Or and gules, a plant vert [and sable].
560-DE MEDICIS DE PROANO: Paly gules and vert, on a chief Or an eagle displayed sable.
574-DE MICHELIS: Vairy gules and azure, on a chief azure a hanging balance Or.
608-DE NAXIS DE PAPIA: Checky gules and azure, a lion Or.
626-DE PAIARANO: Paly sable, gules, and azure, on a delf argent a letter P sable, on a chief Or an eagle displayed sable.
678-DE POLASTRIS DE TURINO: Paly gules and azure, on a chief Or a cock sable.
694-DE PRATO: Per fess Or and vert, and eagle displayed sable.
694-DE PREDA VECA: Per fess sable and argent, a horse rampant counterchanged.
700-DE PUTEO: Paly gules and azure, on a chief azure mullety of eight points Or, a well [argent and Or].
826-DE TREBATONIB_: Paly gules and vert, a letter T argent.
838-DE VAILATE: Vairy bendwise gules and vert, on a chief Or an eagle displayed sable.
864-DE VICE DOMINIS: Vairy bendwise Or and argent.
868-DE VICINII: Barry Or and argent, a [castle? arch? aqueduct?] gules.
872-DE VIGIIS: Paly gules and azure, a mace Or.
880-DE VITUONO: Checky sable and gules.
186-CHALBANI: Bendy Or and argent.
020-LISIADO: Barry Or and argent.
412-PIATESI: Barry gules and azure.
450-BONANNI: Checky Or and argent.
088-BUON ROMEI: Barry gules and vert, a bend argent.
090-BORROMEI: Barry gules and azure, a bend argent.
150-GHINI: Paly Or and argent, a bend sable and a label gules.
238-CARDARINA: Barry gules and vert, on a chief Or a bird close sable.
© 2012 Susan Wensel. All rights reserved.