Which preposition to use with legalization

of Occurrences 3%

Yet we gain the impression that some of his innovations, such as the legalization of enthronement through the transfer of the seal; the changes in the administration of provinces and in the bureaucratic set-up in the capital; and even some of his economic measures were so highly regarded that they were retained or reintroduced, although this happened in some instances centuries later and without mentioning Wang Mang's name.

Which preposition to use with  legalization