That would be the prefix_log table that stored the legacy log, but whether there's anything in it depend on your sites "loglifetime" setting in admin/settings.php?section=logsettinglegacy
"This specifies the length of time you want to keep logs about user activity. Logs that are older than this age are automatically deleted. It is best to keep logs as long as possible, in case you need them, but if you have a very busy server and are experiencing performance problems, then you may want to lower the log lifetime. Values lower than 30 are not recommended because statistics may not work properly."
If someone set a value for that, then they would have been automatically deleted, in which case your system's yearly backups might have what you need, assuming yearly backups were made and kept?
The equivalent for the new standard log loglifetime is at admin/settings.php?section=logsettingstandard
"This specifies the length of time you want to keep logs about user activity. Logs that are older than this age are automatically deleted. It is best to keep logs as long as possible, in case you need them, but if you have a very busy server and are experiencing performance problems, then you may want to lower the log lifetime. Values lower than 30 are not recommended because statistics may not work properly."
If someone set a value for that, then they would have been automatically deleted, in which case your system's yearly backups might have what you need, assuming yearly backups were made and kept?
The equivalent for the new standard log loglifetime is at admin/settings.php?section=logsettingstandard