Question: Which tale became source material for the character of "Othello" whom Iago plots to convince Othello that his wife is having an affair with?

Context paragraphs:
Roderigo: Roderigo is a fictional character in Shakespeare's "Othello" (c.1601-1604), where he serves as the secondary antagonist of the play.  He is a dissolute Venetian lusting after Othello's wife Desdemona.  Roderigo has opened his purse to Iago in the mistaken belief that Iago is using his money to pave the way to Desdemona's bed.  When the assassination of Michael Cassio runs amiss, Iago fatally wounds Roderigo.

Desdemona: Desdemona is a character in William Shakespeare's play "Othello" (c. 1601–1604).  Shakespeare's Desdemona is a Venetian beauty who enrages and disappoints her father, a Venetian senator, when she elopes with Othello, a black man several years her senior.  When her husband is deployed to Cyprus in the service of the Republic of Venice, Desdemona accompanies him.  There, her husband is manipulated by his ensign Iago into believing she is an adulteress, and, in the last act, she is murdered by her estranged spouse.

Iago: Iago is a fictional character in Shakespeare's "Othello" (c. 1601–1604).  Iago is the play's main antagonist, and Othello's standard bearer.  He is the husband of Emilia, who is in turn the attendant of Othello's wife Desdemona.  Iago hates Othello and devises a plan to destroy him by making him believe that his wife is having an affair with his lieutenant, Michael Cassio.

Potassium humate: Potassium humate is the potassium salt of humic acid.  It is manufactured commercially by alkaline extraction of brown coal (lignite)  Leonardite to be used mainly as a soil conditioner.  The extraction is performed in water with the addition of potassium hydroxide (KOH), sequestering agents and hydrotropic surfactants.  Heat is used to increase the solubility of humic acids and hence more potassium humate can be extracted.  The resulting liquid is dried to produce the amorphous crystalline like product which can then be added as a granule to fertiliser.  The potassium humate granules by way of chemical extraction lose their hydrophobic properties and are now soluble.  Depending on the source material product quality varies.  High quality oxidised lignite (brown coal), usually referred to as leonardite, is the best source material for extraction of large quantities of potassium humate.  The less oxidised the coal the less potassium humate extracted.  Sources low in ash produce the best quality.  Less oxidised brown coal contains a higher proportion of the insoluble humin fraction and along with peat which is lower in humic acid content and usually high in ash content requires separation by filtration or centrifugation to remove ash, humin.  Peat is also high in non humified organic matter that needs to be reduced to produce a high quality product.  The benefit of peat is that it is usually 2-3 times higher in fulvic acid content, which are the low molecular weight fractions of humic acid that are high in oxygen containing functional groups and soluble at a low pH of <1.  Fulvic acids have a higher cation exchange capacity and therefore have a higher chemical interaction with fertilisers and are able to form soluble chelates of trace metals.

Nuclear material: Nuclear material refers to the metals uranium, plutonium, and thorium, in any form, according to the IAEA.  This is differentiated further into "source material", consisting of natural and depleted uranium, and "special fissionable material", consisting of enriched uranium (U-235), uranium-233, and plutonium-239.  Uranium ore concentrates are considered to be a "source material", although these are not subject to safeguards under the Nuclear Non-Proliferation Treaty.

Michael Cassio: Michael Cassio, or simply Cassio, is a fictional character in William Shakespeare's "Othello".  The source of the character is the 1565 tale "Un Capitano Moro" by Cinthio; Cassio is unnamed in Cinthio but referred to as "the squadron leader".  In the play, Cassio is a young and handsome lieutenant under Othello's command who becomes one of Iago's several victims in a plot to ruin Othello.

Bianca (Othello): Bianca is a fictional character in William Shakespeare's "Othello" (c. 1601–1604).  She is Cassio's jealous lover.  Despite her brief appearance on stage, Bianca plays a significant role in the progress of Iago's scheme to incite Othello's jealousy of Cassio.  Bianca is traditionally regarded as a courtesan, although this occupation is not specifically designated in the drama.  The character was occasionally cut from performances in the 19th century on moral grounds.  Bianca is not to be confused with Bianca Minola in Shakespeare's "The Taming of the Shrew".

Brabantio: Brabantio (sometimes called Brabanzio) is a character in William Shakespeare's "Othello" (c.1601–1604).  He is a Venetian senator and the father of Desdemona.  He has entertained Othello in his home countless times before the play opens, thus giving Othello and Desdemona opportunity to fall in love.  He is furious upon learning they have eloped, and Desdemona's decision is reported to be the cause of his death in the last act.  The character has no counterpart in Shakespeare's source material for the play but is apparently the Bard's complete invention.  He appears in the first act only and is mentioned in the fifth.

Emilia (Othello): Emilia is a character in the tragedy "Othello" by William Shakespeare.  The character's origin is traced to the 1565 tale, "Un capitano Moro" from Giovanni Battista Giraldi Cinthio's "Gli Hecatommithi".  There, the character is described as young and virtuous, is referred to simply as the ensign's wife, and becomes Desdemona's companion in Cyprus.  In Shakespeare, she is named Emilia, is the wife of Othello's ensign, Iago, and is an attendant to Othello's wife, Desdemona.  While considered a minor character in the drama, she has been portrayed by several notable actresses on film, with Joyce Redman receiving an Academy Award nomination for her performance.

Othello: Othello ("The Tragedy of Othello, the Moor of Venice)" is a tragedy by William Shakespeare, believed to have been written in 1603.  It is based on the story "Un Capitano Moro" ("A Moorish Captain") by Cinthio, a disciple of Boccaccio, first published in 1565.  The story revolves around its two central characters: Othello, a Moorish general in the Venetian army and his unfaithful ensign, Iago.  Given its varied and enduring themes of racism, love, jealousy, betrayal, revenge and repentance, "Othello" is still often performed in professional and community theatre alike, and has been the source for numerous operatic, film, and literary adaptations.

Supporting paragraphs: Iago Michael Cassio
Answer: Un Capitano Moro