Luciano Lomellini Spinola , one of the two primary candidates to be Luis Lomellin who traveled and lived in Mexico is a sixth cousin of Christopher Colombus. There are other relationships but this is the closest that I have calculated so far.

Through another of Luciano Lomellini Spinola family line, he is a sixth cousin to Christopher Colombus's stepmother (Bartolommeo Colon's biological mother)

There is a much closer relationship that needs much more explanation as to its veracity than there is room here. There are numerous chapters explaining how this is possible in the book that I am presently writing. This book will be published soon.

The more I research the possible Luis Lomellini candidates, the more connections I find between Christopher Colombus and the Lomellini/Spinola families of Genoa/Portugal

R A Ricci

The probable and possible Luis Lomeli are all named Luciano Lomellini. Not one of them is named Luigi Lomellini.

R A Ricci

The probable and possible Luis Lomeli are all named Luciano Lomellini. Not one of them is named Luigi Lomellini

The Lomellini family of the 13th,14th, 15th, 16th, 17th, and 18 th centuries, names some women Luigia but did not call the men Luigi. The Italian versions of Luis during this time period, among the Lomellini were Luciano, Luchino, Luchetto, and Luca. There were many named Luciano Lomellini.
There are two Luigi Lomellini in the 19th century. They are first cousins. There is one Luigi Lomellini in the fifteenth century that cannot be our Luis Lomelin.
R A Ricci

Even though Carlo Lomellini and Luciano Lomellini Spinola are fourth cousins, they both have close family, second cousins and uncles that are in contact with each other's more immediate family. Their families both share business interests with Marco Lomellini Lomellini. Marco Lomellini had children that through marriage continued bringing separate branches of Lomellini together.

Marco Lomellini e Lomellini descends through his mothers branch of Lomellini from Napoleone Lomellini and Teodora di Negro.
This is also the closest relationship that fourth cousins Carlo and Luciano have. Before Napoleone Lomellini, the Lomellini families had some money but Napoleone was the first extremely wealthy Lomellini. Napoleons sons were involved in his business transactions and had to follow the rules left in his will. The original will is no longer in existence but transcriptions of it still exist. The directives in the will were meant to keep the family together. Working together and sharing in

St. Catherine of Genoa is the daughter of Giacomo Fiesco and Francesca di Negro. Some times St Catherine's mother is listed as Adorno but I do not know if this is a mistake or if Francesca went by two last names. St Catherine was married to an Adorno which may have contributed to the confusion.