Remove seaborn lineplot legend title

Important: This answer is about the case when a hue is used that appears as a legend title. In all other cases, the question itself already contains the usual way to get rid of a title.

Indeed, seaborn is misusing a legend label as a (subgroup-)title. Hence the idea can be to either remove this label, or replace it with custom text.

Replacing with custom text:

legend = ax.legend()
legend.texts[0].set_text("Whatever else")

Removing the label:

handles, labels = ax.get_legend_handles_labels()
ax.legend(handles=handles[1:], labels=labels[1:])

After having removed the label you may of course still set another (real) title:

handles, labels = ax.get_legend_handles_labels()
ax.legend(handles=handles[1:], labels=labels[1:], title="Whatever else")

import seaborn as sns
g = sns.lineplot(x="myXs", y="myYs", hue="myHue", data=mydf)
g.legend_.set_title(None)

Extending ImportanceOfBeingErnest's answer:

I had the same problem, but the 'Removing the label' example removed the title and first item from the actual legend.

handles, labels = ax.get_legend_handles_labels()
ax.legend(handles=handles[1:], labels=labels[1:])

So, this removes just the legend title:

handles, labels = ax.get_legend_handles_labels()
ax.legend(handles=handles, labels=labels)