How to create Latex table with multiple row categories (such as subcategories)?

Question

I wish to create something similar to the following table

where Ozeki and Yokozuna are categories. I, II, III, etc. are sub categories, and Azuma, Santoro, Kenzo are items in the first column. The cells are to be inputted either numerical values or strings.
I am quite familiar with how to create something like

but clueless as to how to add that first "grand" category. I don't even know what type of table I should use.
A minimal example should suffice. Outer border is not needed.

chsk · Accepted Answer

Indeed, as @leandriis suggests in a comment, multicolumn will help you there. Here's a snippet that also uses the booktabs package to create a nice-looking table:
documentclass{article}
usepackage{booktabs}
begin{document}
begin{tabular}{lccccccc}
toprule
                     & multicolumn{3}{c}{textbf{Ozeki}} & multicolumn{4}{c}{textbf{Yokozuna}} 
cmidrule(lr){2-4}cmidrule(lr){5-8}
                     & I & II &            III            & I & II & III &           IV           
midrule
    textbf{Azuma}   &   &    &                           &   &    &     &                        
    textbf{Santoro} &   &    &                           &   &    &     &                        
    textbf{Kenzo}   &   &    &                           &   &    &     &                        
bottomrule
end{tabular}
end{document}

How to create Latex table with multiple row categories (such as subcategories)?

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