Pimbley's Dictionary of Heraldry - I

Illegitimacy - The Marks of Illegitimacy are varied, and in early examples are scarcely to be distinguished from marks of difference. The earliest known instance in English heraldry is the six lioncels borne by William Longspee, derived from his father, Henry II. Sir John Lovell le Bastard (in the roll of Edward II) bore Lovell, with a label azure. The cognizance of the Black Prince, the three ostrich plumes, became part of the arms of his natural son, Sir Roger Clarendon. Arthur Viscount Lisle, son of Edward IV, placed a baton over his father's arms. In some cases a baton sinister was used, and sometimes it was a border. The descendants of Charles II use the whole arms with a baton sinister or border; those of William IV the baton. With the house of Bourbon the baton distinguished the cadets, while the baton sinister marked the illegitimates.

Impale - To join two coats of arms palewise. (Also written empale.)

Impalement - The marshaling or arranging of two coats of arms on one shield, divided palewise, or by a vertical line. When a husband impales his arms with those of his wife, his generally occupy the dexter side, while the wife's take the sinister. This was not always the case, however. In the impaled shield of John of Gaunt his wife, daughter of Peter of Castile and Leon, occupies the dexter; and the same is true of William Daiziel.

Bishops, deans, heads of colleges, etc., sometimes impale their own arms with those of their office. (Also written empalement.)

Impresa - (im-pre'sá) [Italian] A device, a motto; an impress.

In -

IN BAR - [See under Bar.]
IN BEND - [See under Bend.]
IN CHIEF - [See under Chief.]
IN ORLE - [See under Orle.]

Incensant - (in-sen'-sant) Applied to the boar when borne in a furious or angry position.

Incensed - (-sen'sd) A tern applied to the eyes of any wild creature when represented with fire issuing from them. 

Inclave - (-klave') A form resembling dovetail joints. This is applied to the lines of division on the borders of ordinaries.

Increscent - A term denoting the crescent when represented with its horns toward the dexter side of the shield.

Inde - (in'-dey) A name sometimes given to azure in ancient blazonry. The only reason or excuse for the use of the word seems to be that azure represents saphire, and India was the principal source of supply for those gems.

Indented - Notched like the teeth of a saw. Applied to partition lines, as well as to some of the ordinaries. It differs from the dancette in that the notches in indented are smaller and apply only to the outer edge, whereas dancette affects the whole ordinary.

Indentee - (-dent'ee) [French] Having indents, not joined to each other, but set apart.

Indentilley - (-dent'-il-ley) An ordinary having long indents, somewhat resembling piles conjoined.

Indorse - [See ENDORSE.]

Indorsed- [See ENDORSED.]

Inescutcheon - (-es-kuch'-un) A small escutcheon, or shield, borne within and upon the greater shield. When voided it becomes an orle. It is smaller than the escutcheon of pretense. The inescutcheon can be seen in some of the earliest coats.

Infamed - Applied to a lion or other beast which has lost its tail.

Inflamed - Applied to anything represented as burning or in flames. [FLAMANT.]

Interchangeably posed - Said of bearings placed across each other, as three fishes the head of each appearing between the tail of the other; three swords with hilts in like position; three arrows, etc.

Interfretted - Linked together; interlaced. Said of any charges or bearings linked together, as interlaced crescents, interlaced keys, etc.

Interlaced - The same as INTERFRETTED.

Inveckee - (-vek''ey) A word sometimes employed by heraldic writers to describe double arching.

Invected - (-vek'-ted) The opposite of engrailed. Having a border or outline with the points turning inward toward the ordinary and the convexity toward the field.

Invertant - The same as INVERTED.

Inverted - In a contrary direction; turned the wrong way, as a pair of wings with the points downwards.

Invexed - Arched or enarched.

Islay - One of the heralds of the Lord Lyon's Court, Scotland.

Iron Cross - Order of the Iron Cross - A Prussian order of knighthood, instituted in 1813.

Issuant - (ish'-u-ant) Issuing or coming out of. A charge represented as issuing from another charge. When an animal is represented as issuant only the upper half is depicted.